Keller v. United States

                  UNITED STATES COURT OF APPEALS
                      FOR THE FIRST CIRCUIT

                                           

No. 94-1136

                       STEVE V. B. KELLER,

                      Plaintiff, Appellant,

                                v.

                    UNITED STATES OF AMERICA,

                       Defendant, Appellee.

                                           

           APPEAL FROM THE UNITED STATES DISTRICT COURT

                FOR THE DISTRICT OF NEW HAMPSHIRE

         [Hon. Shane Devine, Senior U.S. District Judge]
                                                       

                                           

                              Before

                    Torruella, Cyr and Boudin,

                         Circuit Judges.
                                       

                                           

   Christopher   Cole,  with  whom   Michael  J.  Donahue,  Donahue,
                                                                    
McCaffrey,  Tucker & Ciandella, David  S. Brown, and Sheehan, Phinney,
                                                                    
Bass & Green, were on brief for appellant.
          
   Gretchen Leah  Witt, Assistant United States  Attorney, with whom
                      
Paul M. Gagnon, United States Attorney, was on brief for appellee.
            

                                           

                         October 19, 1994

                                           

          CYR,  Circuit Judge.    Plaintiff Steven  V. B.  Keller
          CYR,  Circuit Judge.
                             

appeals  from a  belated  judgment dismissing  his Longshore  and

Harbor  Workers Compensation Act suit, see  33 U.S.C.    901-950,
                                          

  905(b)  (1993) (LHWCA),  to recover  damages for  injuries sus-

tained in a  fall on board a maritime vessel  owned by defendant-

appellee United States of  America.  As appellant has  not demon-

strated    nor  careful scrutiny disclosed     that the  unprece-

dented decision-making  delay in this case  rendered the district

court's findings unreliable, we affirm the judgment. 

                                I

                            BACKGROUND
                                      

          In 1978,  the United  States Navy converted  the U.S.S.

ARTHUR M.  HUDDELL,  a World  War II  Liberty Ship,  into a  non-

motorized  barge  for  storing and  transporting  maritime  cable

purchased  by the  Navy  from Simplex  Wire and  Cable  Co.   The

retrofitted HUDDELL was towed to Simplex's facility at Newington,

New Hampshire, for cable  loading in May 1979, where  it remained

moored for two years.  

          The cargo hold had been  adapted to house several round

tanks, recessed sixteen feet into the 'tween deck.  Simplex hired

temporary  employees    known as cable loaders    to descend into

these tanks from  the 'tween deck for the  purpose of winding the

incoming "wet" cable in  concentric layers onto a spool.   During

the HUDDELL's  retrofitting,  the Navy  installed a  nonremovable

metal barrier around Tank 4 to prevent workers on the 'tween deck

                                2

from  falling into the tank.   The barrier  included two uninter-

rupted safety railings  located at  the top of  an access  ladder

attached to the interior wall of the tank to permit access to and

from the tank floor.   In order to exit the tank,  a cable loader

would climb  to the top rungs of the ladder, at which point three

options  were available for getting from the tank onto the 'tween

deck floor:  (1) holding onto a "grab bar," which was attached to

the 'tween deck  floor and  located six inches  from the  outside

edge of the  tank, then  crawling forward and  passing under  the
                                                            

lower railing and between  the vertical stanchions supporting the

two railings;  (2) stepping  in a  crouched position  between the
                                                             

lower and upper railings of the barrier; or (3) climbing over the
                                                             

top railing located approximately five feet above the 'tween deck

floor.

          At  the time Simplex hired Keller as a cable loader, he

was  a  nonmatriculating  sophomore  at  the  University  of  New

Hampshire.   On the night of  November 4, 1979, Keller  went to a

bar, where he and his  friends drank approximately 120-160 ounces

(or  two six-packs)  of beer  between 10:00  p.m. and  11:20 p.m.

Keller reported for work at about 11:30 p.m., and was assigned to

Tank 4 for the first time.  He and several coworkers climbed down

the ladder from  the 'tween  deck into Tank  4 without  incident,

where they loaded cable until 2:00 a.m.  

          When it came time  for a work break, Keller  climbed to

the top of the ladder, and, according to coworker Rhonda Rossley,

grabbed  the lower safety railing  with his left  hand and placed
                                                

                                3

his left foot  on one of the two top rungs  of the ladder.  Then,
        

as he began  to raise  his right leg,  he fell backward,  neither

attempting  to regain his purchase nor  crying out, and plummeted

to the tank floor sixteen feet below, landing on his  head.  When

a Simplex foreman administered first aid, he detected the odor of

alcohol.  A blood-alcohol test taken at 3:00 a.m., some three and

one-half hours after Keller had reported for work, revealed a .14

blood-alcohol level, well above the .10 prima facie blood-alcohol

level for  demonstrating that a  motor vehicle operator  is under

the  influence.   See  N.H.  Rev.  Stat. Ann.    262.A-63  (1963)
                     

(amended  1994, lowering limit to  .08).  Since  the fall, Keller

has remained amnesiac as to all events surrounding the accident. 

          Following  a seven-day  bench trial on  Keller's claims

against  the United  States for  negligently  installing "unsafe"

lighting and railings and  an "unsafe" ladder in Tank  4, and for

failing to warn Simplex  workers of the potential danger,  see 33
                                                              

U.S.C.    905(b), the district court  ultimately awarded judgment

to the United States.  See Keller v. United States, No. 81-549-SD
                                                  

(D.N.H. Dec. 30, 1993).1  

                                II

                            DISCUSSION
                                      

          Three principal  issues must be addressed.   First, did

                    

     1Among  other things,  Keller  alleged that  (1) the  ladder
rungs were wet, slippery,  worn, and irregularly spaced;  (2) the
metal railings  protruded so as to make  it likely that a climber
would  strike his head; and  (3) no warning  of these protrusions
was posted on the ladder.

                                4

the eight-year lapse between  the bench trial and entry  of final

judgment  deprive  the  trial  court findings  of  the  customary

deference on appeal, or violate Keller's constitutional rights to

access to the courts  and due process, see generally  U.S. Const.
                                                    

amends.  I, V  ?   Second, did  the district  court make  clearly

erroneous factual  findings, or  fail to make  required findings,

see Fed.  R. Civ. P. 52(a),  regarding the alleged  breach of the
   

vessel  owner's "turnover" duties of  care?  Third,  did the dis-

trict  court  misdefine a  vessel  owner's  "continuing" duty  to

inspect  or  supervise cargo  loading  operations  for developing

hazards?  

A.   The Decision-making Delay
                              

          First, Keller  claims that an  unprecedented eight-year

delay between trial and  the entry of judgment, coupled  with the

trial  judge's failure  to refresh  his recollection  through re-

course to a complete trial transcript prior to making findings of

fact,  resulted in  a violation  of his  constitutional  right to

"access  to the  courts"  and to  due  process, see  U.S.  Const.
                                                   

amends. I, V; Ad  Hoc Comm. on Judicial Admin.  v. Massachusetts,
                                                                

488 F.2d 1241, 1244  (1st Cir. 1973) (noting that  pretrial delay
                                                           

might  violate  constitutional  rights  if a  civil  litigant  is

"denied  for too long his day  in court"), cert. denied, 416 U.S.
                                                       

986 (1974),  or in  a  violation which  warrants withholding  the

customary appellate deference accorded trial court findings.  Cf.
                                                                 

Chamberlin v. 101 Realty, Inc., 915 F.2d 777, 787 (1st Cir. 1990)
                              

(excusing two-year delay); Fernberg  v. T.F. Boyle Transp., Inc.,
                                                                

                                5

889  F.2d 1205, 1209 (1st  Cir. 1989) (excusing  two and one-half

year delay).   Keller attributes the purported  generality in the

district court findings, see infra Section II.B, to this extended
                                  

decision-making delay,  and  implicitly relies  on  a  conclusive

presumption that the court  was unable to make more  complete and

detailed findings as it  could not recall the evidence  presented

at trial almost eight years earlier. 

          Keller  concedes that  neither Chamberlin  nor Fernberg
                                                                 

concluded that prolonged decision-making  delay, per se, requires
                                                       

vacatur.  Nor  has he cited authority for a per se rule fixing an
                                                  

outer limit on decision-making delay.  Cf. Ad Hoc Comm., 488 F.2d
                                                       

at 1244  (rejecting per se  rule under  Federal Constitution  for
                          

bounding decision-making  delay in state court  civil cases); cf.
                                                                 

also,  Los Angeles County  Bar Ass'n v.  March Fong  Eu, 979 F.2d
                                                       

697,  705-06 (9th Cir. 1992) (conducting ad hoc inquiry to deter-
                                               

mine  whether  pretrial delay  "exceed[ed]  constitutional bound-

aries").

          There are sound reasons for abjuring a per se rule even
                                                       

in  cases involving plainly excessive delay.  In the first place,

ad hoc  appellate scrutiny  is indispensable  to the  core deter-
      

mination whether delay rendered the decision unreliable.  Second-

ly, it is  highly doubtful that  direct appellate review  affords

"an effective means of  enforcing district court timeliness." See
                                                                 

Phonetele, Inc. v. American  Tel. & Tel. Co.,  889 F.2d 224,  232
                                            

(9th Cir.  1989) (delay approximating four  years), cert. denied,
                                                                

112  S. Ct. 1283 (1992).  Thirdly, remands for reconsideration or

                                6

retrial  yield yet  further delays,  exacerbating the  burdens on

litigants.   For these reasons, and  notwithstanding our parallel

supervisory responsibility, see, e.g., 28 U.S.C.   1651 (mandamus
                                     

jurisdiction); Petition of  Henneman, 137 F.2d 627, 630 (1st Cir.
                                    

1943), we consider it  critically important that appellate atten-

tion  remain  focused  on  ensuring that  trial  court  findings,

despite  inordinate  decision-making  delay,  not  be  squandered

unless their reliability  has been undermined.  We  therefore opt

for careful de novo scrutiny of  the entire record with a view to
                   

whether the  prolonged delay in reaching a  decision rendered the

trial  court's findings  of fact  unreliable to  the degree  that

vacation  of its  judgment  is warranted  despite the  admittedly

severe impediments  to reliable  fact-finding in  the event of  a

remand  for new trial.   Cf. Barker  v. Wingo, 407  U.S. 514, 532
                                             

(1972) (long pretrial delays threaten to impair criminal defense,

lest witnesses die, disappear,  or suffer memory loss  or distor-

tion).

          Notwithstanding the eight-year  interval between  trial

and judgment, for  which we  have been unable  to glean  adequate

explanation,  neither Keller  nor the  record on  appeal suggests

that  the  district court  did  not  perform its  decision-making

responsibility  with  care.    As Keller's  several  requests  to

expedite the  decisionmaking  process acknowledge,  the  district

court was in no sense indifferent to its responsibility to render

a decision but encountered  extraordinary docket pressures at the

same  time it  was required  to give  precedence to  its criminal

                                7

caseload.  See Speedy Trial Act, 18 U.S.C.   3161 (1993).  
              

          Nor would  we well serve  the interests of  justice, or

the integrity of the decision-making process, were we  to presume

that  the absence  of a  complete trial  transcript  rendered the

district  court  incapable  of  determining  matters  relating to

witness demeanor and credibility,  or to recollect or reconstruct

trial testimony, through other reliable means (viz., trial notes,
                                                  

voluminous  trial exhibits).  See Keller, No. 81-549-SD, slip op.
                                        

at 16 ("The  court in the  course of rendering  its decision  has

reviewed all of the exhibits . . . .").  After all, the responsi-

bility incumbent on  an appellant to substantiate  a challenge to

the  sufficiency of trial court  findings is not  met merely with

conclusory  allegations that  the trier  of fact  could  not have

recalled or  reconstructed the evidence without  a complete trial

transcript.  Moreover, this case does not require us to speculate

as  to the  reliability of  the trial  judge's findings,  since a

complete trial transcript is available for the purpose.  Thus, as

regards  the claim  that  the trial  judge's findings  themselves

evince prejudice from the extended decision-making delay, we test

Keller's  thesis as in any  other case, by  inquiring whether the

findings were  infected  with  "clear  error" based  on  our  own

painstaking  scrutiny of  the  entire trial  record, including  a

complete  trial transcript.   See  Interstate Commerce  Comm'n v.
                                                              

Holmes Transp., Inc., 983 F.2d 1122, 1129 (1st Cir. 1993) (noting
                    

that  appellate  court must  defer  to  trial court  fact-finding

unless,  after  reviewing entire  record,  it  is  left with  the

                                8

"definite  and firm  conviction that a  mistake has  been commit-

ted").

B.   The Merits
               

          The district  court made seven findings  central to the

merits-related challenges advanced on appeal: 

     (1)  Keller was a "longshore worker"  to whom defendant
          owed a  duty of "ordinary care,"  under LHWCA sec-
          tion 905(b),2  to provide a vessel  in such condi-
          tion that  "an  expert and  experienced  stevedore
          [would]  be able  to  exercise reasonable  care to
          carry  on  its  cargo operations  with  reasonable
          safety," and a duty to  warn the stevedore of  any
          latent safety defects on the vessel not reasonably
          discoverable by an "expert and experienced" steve-
          dore, Keller,  No.  81-549-SD, slip  op.  at  9-10
                      
          (quoting Scindia  Steam Navigation  Co. v.  de los
                                                            
          Santos, 451 U.S. 156, 166-67 (1981));
                

     (2)  Defendant's expert witness, Jan Bijhouwer, relying
          on "applicable" maritime  safety standards in for-
          mulating his  opinion  that the  HUDDELL's  ladder
          design was "safe,"  proved "more persuasive"  than
          plaintiff's competing expert, id. at 13; 
                                           

     (3)  No  eyewitness observed the precipitating cause of
          the  fall (e.g., whether Keller hit  his head on a
                         
          safety rail), id. at 11-12;
                           

                    

     2Section 905(b) provides in pertinent part:

          In the  event of  injury to a  person covered
          under this Act caused  by the negligence of a
          vessel,  then such person . .  . may bring an
          action against such vessel as a third party .
          . . , and the employer shall not be liable to
          the vessel  for such damages  directly or in-
          directly and any agreements or  warranties to
          the contrary shall be void. . . . The liabil-
          ity of the vessel under this subsection shall
          not be  based upon the warranty of seaworthi-
          ness  or a  breach  thereof at  the time  the
          injury occurred.

33 U.S.C.   905(b).

                                9

     (4)  Even  if the  design of  the ladder  deviated from
          "applicable" maritime safety standards  in certain
          respects,  there  was  insufficient evidence  that
          these deviations caused  Keller's fall.   No other
                                 
          accidents  occurred on  this  ladder, despite  the
          fact that  no less than twelve  persons climbed up
          or  down the  ladder  under  identical  conditions
          immediately prior to  and after Keller's accident,
                     
          id. at 13;
             

     (5)  Keller's blood alcohol level  of .14, see supra at
                                                         
          p.  4,  might have  been  a  "significant [causal]
          factor"  in the  accident, Keller,  No. 81-549-SD,
                                           
          slip op. at 15; 

     (6)  If  any design  deviation constituted  a potential
          "hazard," such  hazard was obvious (i.e.,  not la-
                                                  
          tent), and could be "anticipate[d]" by a stevedore
          "if reasonably competent in the performance of his
          work," id. at 13-14; and
                    

     (7)  Even if custom had required that defendant place a
          representative aboard the HUDDELL to monitor cargo
          loading, "a custom-generated duty to supervise and
          inspect does not transfer to the ship owner a duty
          to eradicate dangers reasonably known  to and man-
          aged by the stevedore," id. at 14.
                                     

     1.   The Vessel Owner's "Turnover" Duties of Care
                                                      

          a.   Applicable Law
                             

          The definition of a vessel owner's duties of care under

LHWCA   905(b) is a matter  of law for the district court  in the

first instance, see  Elberg v.  Mobil Oil Corp.,  967 F.2d  1146,
                                               

1149  (7th Cir. 1992); Ludwig v. Pan Ocean Shipping Co., 941 F.2d
                                                       

849, 850 (9th Cir. 1991), subject to de novo review, see Williams
                                                                 

v. Poulos, 11 F.3d 271, 278  (1st Cir. 1993).  Keller claims that
         

by failing  to distinguish  between  "turnover" and  "continuing"

duties,  the district  court  misconstrued the  standard of  care

incumbent upon a vessel owner under LHWCA   905(b). 

          As it pertains  to Keller and  Simplex, in its  current

                                10

incarnation the LHWCA is a strict liability statute.  A longshore

or  harbor  worker such  as  Keller,  who incurs  a  work-related

injury, may recover disability  and medical compensation from the

stevedore-employer (viz., Simplex) even though the  stevedore was
                        

not at fault.   Conversely,  an award of  compensation under  the

LHWCA, such  as Keller recovered  from Simplex, is  the longshore

worker's exclusive remedy against the stevedore-employer.  See 33
                                                              

U.S.C.     904, 905(a); Williams v.  Jones, 11 F.3d 247,  250 n.1
                                          

(1st Cir. 1993).

          Until 1972,  an injured longshore worker  could sue the

vessel  owner on  two distinct  legal theories:   negligence  and
             

breach  of the  warranty  of "seaworthiness."   "Unseaworthiness"

could  be  established more  easily  than  negligence, simply  by

showing that some condition or  appurtenance on board the  vessel

at the time of  the accident was unreasonably hazardous,  even if

the stevedore-employer was  the sole  cause of the  hazard.   See
                                                                 

Seas  Shipping Co. v. Sieracki, 328  U.S. 85, 94 (1946); Ellen M.
                              

Flynn & Dale S. Cooper,  1A Benedict on Admiralty   91, at 5-2 to
                                                 

5-4 (7th ed. 1993) [hereinafter:  Benedict on Admiralty].  Vessel
                                                       

owners thus  became virtual  insurers of  the on-board  safety of

longshore workers.  Although the only legal recourse available to

the  nonnegligent  vessel  owner  was  an  indemnification  claim

against the stevedore-employer, even  that remedy was unavailable

unless  the hazardous  condition or  appurtenance was due  to the

stevedore's negligence.            In  1972,  the LHWCA  remedial

scheme underwent dramatic adjustment.  Congress greatly increased

                                11

the amount of compensation recoverable from the stevedore-employ-

er, repudiated  the warranty  of "seaworthiness"  as a  basis for

third-party  actions  against  the  vessel  owner,  required  the

injured longshore worker to  prove negligence on the part  of the

vessel owner, and precluded a negligent vessel owner from obtain-

ing indemnification from the stevedore-employer.  See 33 U.S.C.  
                                                     

905(b); supra note 2.  These changes were designed "to shift more
                                                                 

of the  responsibility for  compensating injured  longshoremen to
                      

the party best able to prevent injuries: the stevedore-employer."
                                                               

Howlett  v. Birkdale Shipping Co.,  114 S. Ct.  2057, 2063 (1994)
                                 

(emphasis added).   Consequently, at the present  time the duties

of care incumbent upon a vessel owner fall into two broad catego-

ries:   (i) so-called "turnover" duties     those which are to be

discharged before the owner consigns the vessel  to the stevedore
                 

for cargo  loading operations    and  (ii) so-called "continuing"

duties, such  as inspection,  supervision or  intervention, which

may  persist after the stevedore commences cargo operations.  See
                                                                 

Scindia, 451 U.S. at 166-67, 172-76.  There are two distinct sub-
       

categories of "turnover" duty,  depending on whether an unreason-

ably hazardous condition on board the vessel is patent or latent.

          (i)  The Vessel Owner's "Duty of Safe Condition"
                                                         

          First, the  vessel owner's "duty of  safe condition" is

met if the  condition of the vessel when entrusted  to the steve-

dore poses  no reasonably foreseeable  risk to  any worker,  even
                                     

assuming a complete failure on the part of the stevedore-employer

                                12

to monitor the  vessel workplace for safety.   On the other hand,

because longshoring  is particularly dangerous, in  many respects

inherently so, see Johnson  v. A/S Ivarans Rederi, 613  F.2d 334,
                                                 

339 n.5 (1st  Cir. 1980), few  on-board appurtenances would  ever

satisfy such  an exacting threshold.   Accordingly, the "foresee-

ability" standard to which a vessel owner is held under its "duty

of  safe condition" has been  relaxed:  "ordinary  care under the

circumstances" now governs  the owner's discharge of its  duty to

turn  the vessel  over  "in such  condition  that an  expert  and
                                                                 

experienced  stevedoring  contractor, mindful  of the  dangers he
                                    

should  expect to  encounter,  arising from  the  hazards of  the
                            

ship's  service or  otherwise, will  be able  by the  exercise of

ordinary care"  to  conduct  cargo  operations  "with  reasonable

safety to persons and property."   See Federal Marine  Terminals,
                                                                 

Inc.  v. Burnside Shipping Co., 394 U.S. 404, 416-17 n. 18 (1969)
                              

(emphasis added) (citation omitted).  

          Unlike  the  vessel owner,  however,  the  stevedore is

subject to detailed  legislative and administrative prescriptions

for  affording its  workers a  "safe" workplace.   See,  e.g., 33
                                                             

U.S.C.    941  (1993); 29  C.F.R.     1918.1-1918.106,    1918.25

(1993) (implementing regulations for  "ladders"); see also  Scin-
                                                                 

dia, 451 U.S. at 170.  Thus, a vessel owner "reasonably" may rely
   

on the  stevedore-employer's supervision of its  own employees in

their interaction with and  avoidance of "obvious" or "anticipat-

ed" hazards foreseeably associated  with stevedoring on board the

owner's vessel.  See,  e.g., Polizzi v. M/V Zephros  II Monrovia,
                                                                

                                13

860  F.2d 147, 149 (5th  Cir. 1988); Jupitz  v. National Shipping
                                                                 

Co., 730 F. Supp.  1358, 1362 (D. Md.  1990) (noting that  vessel
   

owner's duty is "to turn over the cargo area in a reasonably safe
                                                            

condition; . . . not to turn over the area completely free of all

hazards")  (emphasis added).    Conversely, under  current law  a

vessel owner may be  held liable, even for "obvious"  or "antici-

pated" hazards, upon  a showing that  the owner effectively  dis-
                                                                 

abled the stevedore-employer or  the longshore worker from taking
     

ameliorative  measures to avoid the  hazard.  See  Teply v. Mobil
                                                                 

Oil  Corp., 859  F.2d 375,  378 (5th  Cir. 1988); Theriot  v. Bay
                                                                 

Drilling Corp., 783 F.2d 527, 536 (5th Cir. 1986). 
              

          (ii) The Vessel Owner's "Duty to Warn"
                                               

          The second  sub-category of turnover duty  is the "duty

to  warn" prior to turnover,  which requires the  vessel owner to

alert the  stevedore-employer to  any latent or  concealed defect
     

including "any hazards on the ship or  with respect to its equip-

ment" which "are  known to the vessel [owner]  or should be known
                                                                 

to it in the exercise of reasonable care" and which "would likely

be encountered by the stevedore in the course of his cargo opera-

tions[,]  are  not known  by the  stevedore[,]  and would  not be
                                                              

obvious to or anticipated  by him if reasonably competent  in the
       

performance of his  work."   Scindia, 451 U.S.  at 167  (emphasis
                                    

added).     

          Although Keller concedes that the trial court correctly

quoted  verbatim from the Scindia exegesis  relating to these two
                                 

turnover duties,  Keller, No.  81-549-SD, slip  op. at 10-11,  he
                        

                                14

argues that the court focused its factual inquiry exclusively  on
                                                             

whether  the defendant  vessel owner  owed Keller  a "continuing"

duty of intervention.  See Brief  for Appellant at 27.  We cannot
                          

agree.   Though neither the  district court, nor  for that matter

the  Scindia Court, used  the term "turnover  duty," the district
            

court focused directly on  the two issues material to  the perti-

nent inquiry:  (i) "[c]entral to the issue of legal fault in this

litigation  is whether  the [original  design  of the]  ladder at

issue  was causally  defective," in  light of  "applicable safety

standards" and  other evidence  proffered by Keller,  Keller, No.
                                                            

81-549-SD, slip op. at 13, and (ii)  whether "the notice given by
                                                        

the presence of any such hazard" rendered it obvious, id. at  14.
                                                         

Thus,  the  district court  clearly  identified  and applied  the

proper duty of care.   We turn then to examine its  factual find-

ings.

     b.   Factual Findings on "Turnover" Duties
                                               

           Keller asserts  two challenges  to the district  court

finding  that  the  United  States did  not  breach  its turnover

duties.   First, he  argues that the pivotal  finding    that the

testimony of Jan Bijhouwer,  defendant's expert witness on marine

design, was  "more persuasive" than the  testimony of plaintiff's

expert      is so  conclusory that no  evidentiary basis  for the

finding can be gleaned from  the record.  See Fed. R.  Civ. P. 52
                                             

("In  all actions tried upon  the facts without a  jury . . . the

court shall  find the facts  specially and  state separately  its
                                      

conclusions of law thereon . . . .") (emphasis added).

                                15

          The  crux of our ad  hoc Rule 52(a)  inquiry is whether
                                  

the  trial court  findings  are precise  and  detailed enough  to

enable  effective appellate  review.   See  Knapp Shoes,  Inc. v.
                                                              

Sylvania Shoe Mfg. Corp., 15 F.3d 1222, 1228 (1st Cir. 1994).  As
                        

long  as  the  factual  bases essential  to  the  court's special

findings are reasonably discernible from the record, the dictates

of Rule  52(a) are met.   Id. (noting that the  "'judge need only
                             

make  brief, definite,  pertinent  findings .  .  . there  is  no

necessity for  over-elaboration of detail'")  (citation omitted).

Contrary to Keller's contention, the district court did not begin

and  end  its  analysis  with the  observation  that  Bijhouwer's

testimony was "more persuasive," but expressed one very important
                                              

rationale  for so finding:  Bijhouwer was the only expert witness
                                                  

who based his opinion on "applicable [maritime] safety standards"
                                    

and  on the  possible  consequences any  "deviations" from  those

standards  might  have upon  worker safety.   Further,  the court

proceeded  to point  out that  Keller  had produced  no competent

evidence that the Tank 4 ladder  was defective in any way.  These

"special findings" met the Rule 52(a) requirements. 

          Keller  next  argues that  the  trial court's  findings

(e.g., that  the  ladder  design  was "generally  safe,"  or  its
     

hazardous  features,  if any,  should  have been  obvious  to the

stevedore's employees)  were based upon inherently  unreliable or

inadmissible  evidence,  or  its  refusal to  admit  or  consider

competent  evidence  entitled to  greater  weight.   Whether  the

defendant breached a duty of care is a question of fact, which we

                                16

review only for clear error.  See Fed. R. Civ. P. 52(a); Martinez
                                                                 

v.  Korea  Shipping Corp.,  903 F.2d  606,  609 (9th  Cir. 1990);
                         

Miller v. Patton-Tully Transp.  Co., 851 F.2d 202, 205  (8th Cir.
                                   

1988).   Clear  error review  presupposes appellate  deference to

trial court findings  of fact unless we are left  with the "defi-

nite and  firm conviction  that a  mistake  has been  committed."

Holmes  Transp., Inc., 983 F.2d at 1129.  Particular deference is
                     

due trial  court findings  dependent on witness  credibility, see
                                                                 

DesRosiers  v. Moran,  949 F.2d 15,  19 (1st  Cir. 1991),  to the
                    

degree that error is seldom considered "clear" unless the  credi-

bility assessments  were based on testimony  which was inherently

implausible,  internally  inconsistent, or  critically impeached.

See Anderson v. City  of Bessemer City, 470 U.S. 564, 575 (1985);
                                      

Rivera-Gomez v. de Castro, 900 F.2d 1, 4 (1st Cir. 1990).  
                         

          Under LHWCA    905(b), the  plaintiff must prove,  by a
                                               

preponderance  of the  evidence, both  proximate causation  and a

breach of the applicable duty of care.  See  Bjaranson v. Botelho
                                                                 

Shipping Corp., 873  F.2d 1204,  1208 (9th Cir.  1989); Biggs  v.
                                                             

Logicon, Inc., 663 F.2d 52, 53-54 (8th Cir. 1981).  Since action-
             

able negligence under the  LHWCA depends on the fluid  concept of

"reasonableness" in  the circumstances, the LHWCA provides little

substantive  guidance on  vessel-owner conduct  violative of  the

various duties of  care.  See Scindia, 451  U.S. at 165-66 ("Sec-
                                     

tion  905(b) did not specify the acts  or omissions of the vessel

that would  constitute  negligence. .  . .  Much was  left to  be

resolved through the 'application  of accepted principles of tort

                                17

law and  the ordinary  process of litigation.'")  (citation omit-

ted).   Generally  speaking,  the fact-finder  should assess  the

"reasonableness" of the vessel  owner's conduct "by balancing the

usefulness to the [vessel] of the [allegedly] dangerous condition
          

and  the burden involved in curing it against the probability and
                                                             

severity of the harm it poses."  Johnson, 613 F.2d at 348 (empha-
                                        

sis  added); see also Miller, 851 F.2d  at 205 (same).  And, even
                            

though  "proof of [the  vessel owner's] adherence  to an industry

practice  or custom  is not  dispositive on  the issue  of negli-
                                        

gence," Martinez,  903 F.2d at 610  (citations omitted) (emphasis
                

added), often the plaintiff's case  will "depend on the existence
                                                

of  statutes, regulations  and customs  allocating responsibility

for repairs of  defective equipment [between the owner and steve-

dore]," since these sources are probative of the risks a "reason-

ably competent" stevedore should  anticipate and manage.  See  1A
                                                             

Benedict on Admiralty    94, at 5-25 (emphasis added);  see also,
                                                                

e.g., Martinez, 903  F.2d at  609 (noting, on  review of  summary
              

judgment,  that "[vessel owner] . . . submitted the affidavits of

a  licensed ship master and  a naval architect,  who claimed that

the platform is standard in  the industry and meets international

requirements").  

          Keller   challenges  the  cornerstone  finding  by  the

district court:  that Bijhouwer's expert opinion was founded on a

"persuasive" appraisal of  "applicable" industry standards.   The

gist of  Bijhouwer's testimony  was that he  personally inspected

the Tank 4  ladder after Keller's fall, measured  its dimensions,

                                18

and climbed out of Tank 4 several times by pulling himself  under
                                                                 

the lower railing with the  aid of the metal grab bar  mounted in

the 'tween deck floor.  In twenty-four years  as a marine survey-

or, approximately five  to ten percent  of the vessels  Bijhouwer

had encountered were equipped with  ladder-railing configurations

similar to Tank  4.  Bijhouwer found the Tank  4 ladder "easy" to

climb,  and  "perfectly safe."    He  consulted two  fixed-ladder

safety standards governing "shipboard  installation as opposed to

land-based installation":   the Maritime  Administration standard

(MARAD) (1965) and the American Society for Testing and Materials

standard (ASTM)  (1983).  In Bijhouwer's  opinion, both standards

confirmed that the Tank 4 ladder-railing design met  or surpassed

applicable maritime safety standards.3   

          Finding no  merit in  Keller's other challenges  to the

district  court's credibility  determinations,4 we  focus on  two

                    

     3Minor measurement "deviations"  between MARAD-ASTM and Tank
4 included, inter alia: the facial width of ladder rungs (slight-
                      
ly  over 14 inches; standard  14 inches); rungs  (1-1/2 inches by
1/2  inch;  standard 3/4  inch by  3/4  inch); and  toe clearance
behind  rungs (5 inches at sides, 14  3/4 inches in middle; stan-
dard minimum 5 inches). 

     4For  example, Bijhouwer  testified  that a  person who  was
exiting Tank 4 for  the first time might be able to do so "blind-
folded."   Keller  characterizes this  testimony as  patently in-
credible, especially in view  of other testimony that Tank  4 was
"more difficult" to exit  than the tanks on other  vessels (e.g.,
                                                                
the  FURMAN)  then moored  at  Simplex.   On  redirect,  however,
Bijhouwer  clarified that  the  ladder and  grab bar  combination
installed in Tank 4 was so well designed that, after one trip up,
                                                                
a  climber  could use  it  "blindfolded."   Bijhouwer's  redirect
testimony would enable a  reasonable inference that Simplex, once
                                                           
it  became acquainted  with  the Tank  4 configuration  following
turnover,  was in no sense disabled  from informing its employees
about  at least one safe  method of exiting  the tank.  Moreover,
the  fact that other witnesses  testified that the  Tank 4 ladder

                                19

related contentions.   First,  Keller quarrels with  the district

court ruling that ASTM was an "applicable" industry standard.  He

points  out that  the  ASTM was  promulgated several  years after

Keller's  fall,  for  the  purpose  of facilitating  inter-vessel

exchangeability of component parts, rather than promoting  safety

concerns.   And, because Bijhouwer  conceded at trial  that MARAD

required  an  unobstructed  gap in  the  Tank  4 railing,  Keller
                               

contests the district court ruling that MARAD was an "applicable"

industry standard and  disagrees that the Tank  4 ladder substan-

tially conformed with the MARAD design.  

          These  contentions cannot  withstand scrutiny.   Keller

does not explain why  a maritime safety standard like  ASTM would

be wholly  "inapplicable" simply because it  had been promulgated
         

after the accident.  In this context, "applicability" connotes no

statutory or  regulatory compulsion to conform  with a particular
                                              

standard.  See  infra note 5.   Rather, "applicability"  connotes
                     

mere relevance:  that ASTM  had some tendency to make it  more or

less likely  that the defendant  and Simplex would  have regarded
                                    

the  ASTM norm  as a  minimum safety  standard for  the industry.

There  is  no evidence  that  general  maritime safety  standards

changed  so dramatically  between  1979 and  1983  that ASTM  was

rendered  wholly  immaterial as  an  indicator  of 1979  industry

                    

was "more"  difficult to climb did  not compel a  finding that it
was defective, since (1)  these lay witnesses testified to  their
personal experiences  only, not  to safety  design; and  (2) this
inapposite comparison (i.e., "more  difficult" as opposed to "too
                           
difficult") would not show  that the Tank 4 ladder  was "unsafe,"
only  that other Navy ships moored at Simplex had "safer" ladders
(i.e., exceeded applicable maritime safety standards).
     

                                20

safety practices, see Fed. R. Evid. 401, nor that ASTM was  based
                     

exclusively on post-1979 data.   Further, in response to Keller's

contention  that  ASTM's purpose  was  merely  to facilitate  the

interchangeability   of  component  parts,  we  note  Bijhouwer's

testimony  that  though the  maritime  standards  he relied  upon

(including  ASTM) might not be exclusively safety-oriented, there
                                          

were  "safety-related aspects  to all  of [these  industry] stan-
                                     

dards."  Thus, it was not clear error to find that ASTM possessed

some probative value in  determining industry safety practices in

1979.  

          Even if ASTM were deemed wholly  "inapplicable," howev-

er, it was but  one of two independent maritime  safety standards
                                      

on  which Bijhouwer relied.   Keller therefore would  have had to

hobble both the ASTM and the MARAD standards in order to prevail.
                                  

Viewed as  an enumeration  of minimum safety  recommendations for
                                     

the  industry,  MARAD is  conspicuously  silent  on many  matters
                                               

Keller considered pertinent to  the defendant vessel owner's duty

of care, including  any unequivocal recommendation that  a gap be

left in  safety railings which extend  around the top of  a fixed

ladder.   Bijhouwer testified that  MARAD recommended such  a gap

(or  removable  railings)  only  as needed  to  facilitate  cargo

loading via the deck on which the railings are located.  Here, of
                                                      

course, the cable was not loaded into Tank 4 across the HUDDELL's
                                                   

'tween  deck where the safety railings were located, but from the

main  deck, down  through an  upper hatch  and into  Tank 4.   He

further testified that MARAD  recommends such an "access opening"

                                21

only  in  "deck"  railings  near ladders,  citing  two  plausible

reasons that this would  not indicate that a complete  gap should
                                                     

have  been left in  the Tank 4 railings:  (1) the MARAD provision

refers  exclusively to railings on  the periphery of  the main or

weather deck of the vessel, not  to railings on lower decks, like

the 'tween  deck; and  (2) the  undefined  term "access  opening"
                                         

might reasonably mean any  aperture through which a  person could

exit safely, such as the 27-inch space under the lower railing on
                                            

Tank 4.   Bijhouwer's  testimony likewise  was bolstered  by OSHA

regulations, which presumably  impose a heightened obligation  on
                                                  

the stevedore to  provide its employees with  a "safe" workplace.

See 33  U.S.C.   941.   Yet even  the OSHA standards do  not dis-
   

courage the ladder configuration  found on Tank 4.  See 29 C.F.R.
                                                       

  1918.25.  Thus, Keller failed to weaken Bijhouwer's interpreta-

tion and application of MARAD.

          To  the  extent that  the  technical  aspects of  MARAD

invited expert interpretation, the district court was entitled to

rely  on Bijhouwer's testimony,  especially since Keller tendered

no persuasive counter-interpretation:

          Compliance  with the customs  and practice of
          an industry, while relevant and admissible[,]
          is not necessarily due  care.  It may, howev-
          er, be  evidence of due care  and when relied
                          
          on by the fact  finder "his findings will not
          be lightly disregarded unless there is a par-
                                                       
          ticularly strong showing of the unreasonable-
                                  
          ness of the customary practice."

1 Martin J. Norris, The Law  of Maritime Personal Injuries   9:5,
                                                          

at 453  (4th ed. 1990) (quoting Cia  Maritima Del Nervon v. James
                                                                 

J. Flanagan Shipping  Corp., 308  F.2d 120, 125  (5th Cir.  1962)
                           

                                22

(emphasis  added));  McGann  v. Compania  de  Navegacio  Maritima
                                                                 

Netumar, 586 F.  Supp. 1568,  1571 (D. Md.  1984) (evidence  that
       

ladder was "typical" or "standard" is probative of vessel owner's

nonnegligent conduct).    Van Dissell,  Keller's expert  witness,

conceded that he never consulted the ASTM  standards, and neither

referenced nor analyzed MARAD before surveying the Tank 4 ladder.

We  think it clear that this effort  fell well short of the "par-
                                                                 

ticularly  strong showing," see Cia Maritima Del Nervon, 308 F.2d
                                                       

at 125 (emphasis added), needed to demonstrate clear error in the

trial court's decision  to credit Bijhouwer's expert  recommenda-

tions relating to an "applicable" industry "standard."  

          Keller concedes that van  Dissell relied on three land-
                                                                 

based  safety  standards, or  at  least on  safety  standards not
     

intended  for  applications  distinctively  maritime  in  nature:

Department of Defense Military  Standard Human Engineering Design

Criteria for Military Systems, Equipment and Facilities, MIL-STD-

1472  (1970);  American  National  Standards  Institute's  (ANSI)

Standard  Safety Code for Fixed  Ladders (1956 &  1974); and OSHA

Standards for Fixed  Ladders, 29  C.F.R.   1910.27  (1975).5   In

general, differentials between land-based and maritime design and

                    

     5Keller did  not contend that these  OSHA standards directly
                                                                 
applied to defendant.   Therefore, even a failure to  comply with
the OSHA standards would not  entitle Keller to claim  negligence
per se.   And  in  fact, the  OSHA  standards were  not  directly
      
applicable  to defendant,  because  (1) they  do  not pertain  to
maritime  employment  of longshore  and  harbor  workers, cf.  33
                                                             
U.S.C.   941; 29 C.F.R.    1918.1-1918.106; and (2) they regulate
only the obligations of employers, see Martinez, 903 F.2d at 611;
                                               
Bandeen v. United Carriers (Panama), Inc., 712 F.2d 1336, 1339-40
                                         
(9th Cir. 1983) (same), and defendant was not Keller's employer.

                                23

safety codes are  necessitated by the  unique spatial and  weight

constraints on working maritime vessels.   The van Dissell bench-

marks undoubtedly set  more stringent safety specifications  than

the MARAD model,  and thus were  relatively "safer," but  Scindia
                                                                 

inquires  only whether  Simplex could  have anticipated  that the
                                                       

vessel owner would consign  a vessel with these heightened  land-

based safety  specifications.   By contrast, Bijhouwer  testified

that  shipyards commonly  consult  standards, such  as MARAD,  in
                                                            

designing and constructing merchant vessels, rather than the more
                                                        

generalized  military  specifications  like   MIL-STD-1472;  and,

further, that he had encountered  the Tank 4 ladder configuration

in at  least five to ten  percent of the merchant  vessels he had

surveyed. 

          Second, Keller attacks, as internally  inconsistent and

inherently implausible, the Bijhouwer  testimony that the 27-inch

space  beneath the  lower safety  railing on  Tank 4  afforded an
              

adequate "access  opening" according to MARAD.   Bijhouwer testi-

fied on  deposition that  a minimum  vertical gap  of twenty-five

inches  beneath the  lower  railing  would  be a  "safe"  "access

opening"  for  exiting Tank  4.    At trial,  however,  Bijhouwer

conceded that the grab bar, which  was 4 1/8 inches high, was set

into the 'tween deck floor six inches from the ladder and the rim

of Tank 4.   Confronted with this configuration     indicating an

actual clearance of 22 7/8 inches    Bijhouwer nonetheless stated

that  the grab bar posed no hazardous interference.  He explained

that there  would remain  at least a  25-inch clearance  directly
                                                                 

                                24

beneath the lower railing where it passed over the six-inch ledge
                                                                 

of the tank, and  that this clearance was needed only to accommo-
           

date the  height of the climber's  body as he placed  his knee up

onto  the tank  ledge.6   In  that  position, the  climber  would

attain   maximum   vertical   posture   (measured   from  stooped
                

head/shoulders to  knee), at which  point his body  would flatten

out  to less than twenty-five inches as he pulled himself forward
                                                                 

and through the narrower opening between  the top of the grab bar
           

and  the  lower railing.7      While Keller  characterizes  these

movements as  dangerously acrobatic,  it is well  recognized that

longshore  workers are  called upon  to cope  with uncomfortable,

cramped positions in the close confines of a vessel.  See,  e.g.,
                                                                

Bjaranson,  873 F.2d at 1208 ("the men, according to the testimo-
         

ny, could have squeezed around the leg of the crane" to avoid the
                       

                    

     6Keller argues that  the method of  egress endorsed by  Bij-
houwer  was unmanageable because the climber  would have to place
his knee on a narrow  coaming that raised 7/8 inches at  the edge
of the  tank,  which  Bijhouwer conceded  would  "cut"  into  the
climber's knee.   In  fact, however,  Bijhouwer testified  that a
climber could  place his  knee "momentarily" between  the coaming
                                                    
and the grab bar, not on top  of the coaming.  When asked if  the
                                            
coaming  would  then "dig[]  into  your  knee," Bijhouwer  simply
responded that "[y]ou can feel the coaming."  
                              

     7Keller likewise relies on Bijhouwer's admission that at the
time he first formulated  his opinion that the ladder  design was
safe, he  had not  considered the  actual conditions (e.g.,  wet,
                                                          
cold, artificial  lighting) in Tank  4 on the night  of the acci-
dent.   Nevertheless,  when asked  at trial,  Bijhouwer testified
that those  conditions did not alter his opinion as to the safety
of  the  ladder design.   He  explained,  for example,  that even
though  Keller was wearing heavy clothing at the time, the clear-
ance beneath the  lower safety  railing would be  adequate for  a
climber  emerging from the tank, because  clothing might catch on
                      
the railing only as a  climber was backing into the tank,  not as
                                               
he was pushing forward. 

                                25

hazard) (emphasis added).   Further, Bijhouwer testified that the

lower railing served both  (i) a safety function, since  it would

protect  an exiting climber from falling  backward into the tank,

and (ii) a  utilitarian purpose, since  it would provide  Simplex
   

with the option to spool  wire into Tank 4 above the  'tween deck
                                                

level.  See Johnson, 613 F.2d  at 348 (trier of fact may consider
                   

"the  usefulness to  the  [vessel] of  the [allegedly]  dangerous
                

condition")  (emphasis added); see  also Miller, 851  F.2d at 205
                                               

("The  court  found that  the toolbox  was  a necessary  piece of
                                                                 

equipment  for the barge and  that it was  situated reasonably to
         

keep it out of the way of the  workers on the barge. . . .  Simi-

larly,  the court found that whatever hazard was presented by the

counterweight was  justified by  its important safety  purpose of
                                                              

keeping  the  toolbox  lid  from  snapping  shut  unexpectedly.")

(emphasis added).

          According to  Bijhouwer, therefore,  the Tank  4 ladder

incorporated at least one "safe" method of egress compatible with

MARAD (i.e., "under" the lower safety railing); hence, the vessel
           

owner had  not provided  Simplex with an  "unavoidably" hazardous

ladder.   See Teply,  859 F.2d at  378.  Thus,  even if MARAD had
                   

been the  only "applicable" industry standard  on which Bijhouwer

could rely, it afforded sufficient support for the district court

finding  that  the  defendant  vessel owner  had  discharged  its

turnover  duty of  safe  condition, on  the  ground that  Simplex

should have "anticipated" and  managed the equipment as designed,

whatever its inherent, but avoidable, risks.  
                                    

                                26

          Keller further  contends that the trial  court erred in

finding that any potential  risks attending the use of the Tank 4

ladder were  "obvious."  He  relies on (i)  Bijhouwer's testimony

that it would be  "reckless" for Simplex employees to  attempt to

exit Tank 4 by passing between  the two safety railings or "over"

the top railing, and (ii) evidence that Simplex employees contin-

ued to use both these methods after turnover.  Keller argues that

this latent  design "defect"  generated the  independent turnover

duty  that the vessel owner warn Simplex or its longshore workers
                                

of the hidden danger.  This contention, too, is flawed.

          First,  Keller  incorrectly  assumes  that  by adopting

Bijhouwer's  testimony  that  MARAD  and  ASTM  were "applicable"

safety standards, the  trial court likewise  necessarily credited

Bijhouwer's  expert opinion (not  based on  MARAD) that  it would
                                

have  been reckless to utilize  the two other  methods of egress.

On the contrary, however, the court did not adopt that portion of

the Bijhouwer testimony but  went on to note instead  that Keller

had  proffered no evidence of any design defect whatsoever in the
                                                          

Tank 4 ladder; for  example, that any accident had  ever occurred
                                     

on  the  ladder when  persons other  than  Keller used  these two

alternate  methods under  substantially similar  conditions (wet,

cold,  artificial lighting).  See,  e.g., McKinnon v. Skil Corp.,
                                                                

638 F.2d 270, 277 (1st Cir. 1981) (subject to Rule 403 balancing,

evidence of prior  accidents under similar conditions  admissible

to show design defect); cf. Martinez, 903 F.2d at 609 (at summary
                                    

judgment, vessel  owner met  burden by "offer[ing]  evidence that

                                27

during the vessel's seven years of operation no longshoreman ever

fell into one of the ladder openings on the lashing platforms and

no complaints were lodged concerning the platforms"); McGann, 586
                                                            

F. Supp. at  1571 ("[N]o other accidents or complaints concerning

this type  of ladder have been reported . . . ."); accord Pittman
                                                                 

v. Littlefield, 438  F.2d 659,  662 (1st Cir.  1971) (absence  of
              

other  accidents under  substantially similar  conditions  may be

probative of "safe" condition) (applying New Hampshire law).

          Second,  even if  the  district court  had agreed  with

Bijhouwer's assessment  of the risks attending  the two alternate

methods of  egress, Bijhouwer never intimated  that those methods

posed  hazards not readily foreseeable by  Simplex.  Scindia, 451
                                                            

U.S. at 167  (noting that  duty to warn  exists only if  "defect"

"would not be obvious to or anticipated by [stevedore] if reason-

ably competent in  the performance  of his work").   The  alleged

design  defect  (two  fixed railings)  was  in  no sense  latent.

Unlike a hairline fracture in the rung of a  ladder, for example,

which might  render the ladder configuration  not reasonably safe

for any unwarned usage, the juxtaposition of the two railings and
       

the absence of posted instructions put Simplex on notice that its

employees,  unless instructed  otherwise, might  attempt  to exit

Tank  4 in any of three ways.   If Simplex had deemed Bijhouwer's

"under"  method the only "safe" one, it could have instructed its

employees not to use the two alternate methods.  Or if it consid-

ered  all  three  methods "unsafe,"  it  could  have removed  the

railings between the stanchions at the top of the ladder.  

                                28

          Relying on the  fact that he was never  in Tank 4 prior

to  the  night of  the  accident,  Keller wrongly  presumes  that

obviousness and latency are measured by what a relatively inexpe-

rienced  longshore worker  might observe.   Instead,  the Scindia
                                                                 

standard turns primarily on what an "experienced" stevedore, like

Simplex, reasonably would  be expected  to notice.   By the  same
       

token, if the  district court correctly  found that even  Simplex

longshore workers  reasonably could be expected  to recognize any
                 

such  defects,  it surely  follows  that  their more  experienced

stevedore-employer should have discovered the  defects during the

course  of its extended two-year stewardship of the HUDDELL.  See
                                                                 

Bjaranson, 873 F.2d at 1209 n.7 ("The condition of the ladder was
         

apparent and obvious  when Bjaranson's employer,  the stevedoring

contractor, boarded the ship and assumed the control of the cargo

operation. Although  the condition may  not have been  obvious to

Bjaranson  at night, the fact  that the condition  was obvious to
                                                                 

his  employer eliminated whatever  duty there may  have been upon
             

[the vessel owner] to  warn the individual employees.") (emphasis

added).

          Next, Keller contends that the district court improper-

ly  considered his blood-alcohol level  at the time  of the acci-

dent,  since the  doctrine of  pure comparative  fault  would not

permit contributory  negligence to  defeat Keller's  LHWCA claim,
                                          

but only  to abate  damages.   See Johnson, 613  F.2d at  347; 1A
                                          

Benedict on Admiralty   56,  at 3-33.  First, the district  court
                     

explicitly acknowledged that had Keller proven that the defendant

                                29

vessel  owner was a cause  of Keller's accident,  the court could
                   

not have treated Keller's  blood-alcohol level as a total  bar to

recovery under the LHWCA.  See Keller, No. 81-549-SD, slip op. at
                                     

15 ("The court is, of course, aware that were negligence found on
                                                                 

the part  of the ship  owner, the  intoxication of Keller  . .  .
                            

would  not  serve  necessarily  to totally  disqualify  him  from

recovery.")  (emphasis  added).    Second,  under  the  analogous

comparative  fault  doctrine  for LHWCA  compensation  awards,  a
                                                             

stevedore  may  defend by  proving  that  the longshore  worker's

injuries were caused "solely" by his intoxication, cf. 33  U.S.C.
                                                      

  903(c).  While the longshore worker initially enjoys a rebutta-

ble  presumption against such a finding, id.   920(c), the steve-
                                            

dore's defense is not  unprovable.   See, e.g., Walker v. Univer-
                                                                 

sal  Terminal &  Stevedoring Corp.,  645 F.2d  170, 173  (3d Cir.
                                  

1981)  (finding    903(c) intoxication  defense established,  and

noting that the  rebuttable presumption "falls  out of the  case"

once stevedore  proffers  "substantial evidence"  that  longshore

worker's intoxication was sole cause of injury or death).  

          Similarly, in a section  905(b) action, the trial court

may assess  the quality of  the vessel owner's  rebuttal evidence

where the  longshore worker failed  to demonstrate a  vessel "de-

fect"8  and where  the vessel  owner has  proffered "substantial"

                    

     8Given the  Scindia  standard,  evidence  of  Keller's  high
                        
blood-alcohol level cannot be  wholly divorced from the threshold
question whether  a defective design  rendered the Tank  4 ladder
"unreasonably"  dangerous.    A  written  policy forbade  Simplex
workers  from  reporting to  work  intoxicated.   Thus,  Keller's
blood-alcohol  level would be relevant to whether the ladder con-
stituted an "unreasonably" dangerous  condition, since the vessel

                                30

evidence of the longshore worker's intoxication.  Here, the trial

court's consideration of the blood-alcohol level followed direct-

ly upon  its observations concerning Keller's  failures of proof:

(1)  the absence of persuasive  expert testimony that  the Tank 4
                                                

ladder  design was  so inferior  to anticipated  safety standards

that the defendant vessel  owner could not entrust the  equipment

to  the stevedore's able charge; and (ii) the absence of evidence

of  other accidents  on  the ladder  under substantially  similar

conditions.   In  this context,  we interpret  these trial  court

observations as  an acknowledgment  not only that  Keller utterly

failed to carry  his burden of proof  but that the only  credible
                                                       

evidence  of possible  causation  (i.e., Keller's  heavy drinking
                                       

earlier  in the evening and his high blood-alcohol level one hour

after  the fall) in  no respect  implicated the  defendant vessel
                                           

owner.  See supra note 8.
                 

          Keller further claims  that but for  two items of  evi-

dence which the district court improperly ignored or excluded, we

would be compelled to conclude  that the district court committed

clear error.   First, the district court  excluded the deposition

testimony of eyewitness Rhonda Rossley, who expressed the opinion

that Keller  had hit  his head  on a railing  prior to  the fall.

Nonexpert-opinion testimony is permitted  only if "(1) rationally

based on the perception of the witness and (2) helpful to a clear

                    

owner, in turning over  the Tank 4 ladder, reasonably  could rely
on  compliance with the stevedore's policy  on intoxication.  See
                                                                 
Johnson,  613 F.2d  at  348 (trier  of  fact must  consider  "the
       
probability and severity of the harm [the condition] poses").  
           

                                31

understanding of  the witness' testimony or  the determination of

the fact in issue."   Fed. R. Evid. 701.  See  Swajian v. General
                                                                 

Motors Corp., 916  F.2d 31, 36 (1st Cir. 1990).   The trial court
            

ruled that the  proffered deposition testimony  did not meet  the

first  Rule 701 test because Rossley "did not see [Keller] strike

his head, nor could she see  his right hand before he fell[, nor]

observe whether his left hand or his left foot first lost contact

with, respectively, the railing or the ladder rung."  Keller, No.
                                                            

81-549-SD, slip op. at 12.  

          We  review a Rule 701 ruling only for manifest abuse of

discretion.  See United  States v. Paiva, 892 F.2d 148,  156 (1st
                                        

Cir. 1989).  We  find no abuse  of discretion.  First,  Rossley's

opinion necessarily  depended upon  a forbidden Rule  701 "infer-

ence," because she (i) neither saw Keller strike  his head on the

railing, (ii)  nor testified to any other sensory perception from
                                   

which  one might rationally infer such an impact (e.g., the sound
                                                      

of impact,a sudden jolt orhalt in Keller's upwardprogress, a pre-

 or post-impact cry, or any outward appearance of a head wound or

bleeding).9  Cf. Swajian, 916 F.2d  at 36 (finding clear abuse of
                        

discretion  in allowing lay opinion that wheel fell off rear axle

before  car  flipped over,  based  exclusively  on the  witness's
      

observation that he first  saw wheel crossing the road  while the
                                                             

                    

     9Although a medical  doctor testified that Keller  sustained
an eye injury which  could have been consistent with  the Rossley
inference, given that  Keller also suffered  head trauma when  he
landed head-first on the tank floor sixteen feet below the 'tween
deck  the doctor  could not  testify that  such an  inference was
compelled. 

                                32

flip-over was in  progress).  Although  Keller's failure to  call

out or  to try to regain  hold of the ladder  could be consistent

with  sudden disorientation  or  even unconsciousness,  as a  lay

witness  Rossley  would  have  had no  nonspeculative  basis  for

excluding  possible causes other than  a blow to  the head (e.g.,
                                                                

intoxication, fatigue and heavy exertion).  

          Second, and perhaps more  importantly, this was a bench
                                                                 

trial,  in which  the trial  judge would  not only  determine the
     

admissibility  of the evidence but serve as the ultimate trier of

fact.  The Rule 701 admissibility determination turns on  whether

the  inference drawn by the nonexpert lay witness would be "help-
                                                                 

ful to  . . .  the determination  of the fact  in issue."   Thus,
   

having considered  the entire  proffer, the trial  judge excluded
                                      

the Rossley opinion testimony because  the court found no  suffi-

ciently reliable  basis for the speculative inference on which it

was based.  Not only do we agree, but nothing would have required
                                                                 

the trial judge, as trier of fact, to credit  the Rossley opinion

had it been admitted in  evidence, especially since she possessed

no particular  skill or experience which would  have assisted the

trial court's fact-finding insight.  Cf., e.g., Soden v. Freight-
                                                                 

liner Corp., 714 F.2d 498, 512 (5th Cir. 1983) (nonexpert witness
           

with  eighteen years'  experience repairing  trucks can  give lay

opinion whether truck was defective).   

          Finally, Keller contests the exclusion of evidence that

Simplex cut out  the two railings  on the Tank  4 ladder one  day

after the accident, as proof that the original ladder design con-

                                33

stituted an "unreasonably" dangerous  condition.  Keller suggests

that this evidence was admissible notwithstanding Rule 407, which

requires  the exclusion  of  subsequent remedial  repairs by  the

defendant  only, not by nondefendants  like Simplex.  See Raymond
                                                                 

v. Raymond Corp., 938 F.2d 1518,  1524 (1st Cir. 1991); Koonce v.
                                                              

Quaker  Safety Prods. & Mfg. Co.,  798 F.2d 700, 719-20 (5th Cir.
                                

1986).  

          At  best, subsequent  remedial measures  are considered

marginally probative of  prior negligence.  See  John H. Wigmore,
                                               

Evidence   283, at 174-75 (1979).  In this case, moreover, defen-
        

dant could have capitalized  on the very same evidence  to demon-

strate that Simplex was expected to make such  structural altera-

tions to the HUDDELL without first consulting defendant, and that

defendant was entitled to  rely on Simplex, as a  reasonably com-

petent  stevedore,  to  take such  preemptive  measures  provided

Simplex deemed them  necessary for  its employees'  safety.   See
                                                                 

also  infra note 11.   Under the Scindia  delineation of turnover
                                        

duty,  therefore, this evidence was at least a "wash" for Keller,

and actually may  have helped  defendant more than  Keller.   For
                                        

these reasons,  we conclude that  the exclusion of  this evidence

was at most  harmless.  See Fed. R. Civ.  P. 61 (erroneous exclu-
                           

sion  of evidence harmless if it "does not affect the substantial

rights of the parties").10 

                    

     10Keller  catalogues various  documentary exhibits  which he
contends  were improperly  excluded.   We  find  no error.    For
example,  Exhibits 10, 21, and 65 were proffered to establish the
contents of  the contract  between Simplex and  defendant.   This
issue was  mooted by the finding  that the Tank 4  ladder did not

                                34

     2.   Post-Turnover Duties of Intervention
                                              

          Leaving  no ground  unturned,  Keller  argues that  the

court erred in ruling that the defendant did not breach its post-
                                                                

turnover duties:   to  supervise and  inspect the HUDDELL  during

cable loading and to intervene and remedy any hazardous condition

that  developed following turnover.  See Scindia, 451 U.S. at 172
                                                

(noting that post-turnover duty  to intervene to remedy unreason-

ably dangerous  condition  may derive  from  custom or  from  the

vessel owner's contractual obligation  to the stevedore).  Keller

contends  that the  court  (1)  disregarded  his claim  that  the

contract  with Simplex  required  the defendant  vessel owner  to

intervene to  effect any safety-related  alterations during cargo

operations; (2) ignored Keller's evidence that it was a customary

or established  practice that  the defendant monitor  the HUDDELL

during  loading operations; and (3)  erred as a  matter of law in

                    

constitute  an  unreasonably  dangerous  condition.    See  infra
                                                                 
Section  II.B.2 &  note  11.   Exhibits 34  and 34A  were largely
cumulative  of evidence  already admitted  and  any noncumulative
portions were provided in the van Dissell testimony.  See Fed. R.
                                                         
Civ.  P. 61 (harmless error); Fed. R. Evid. 403 (governing admis-
sion of "cumulative" evidence).  Finally, Exhibit 73    a mock-up
of a portion of the Tank 4 ladder, used for demonstrative purpos-
es at  trial    was  excludable due  to failure to  lay a  proper
foundation  for  its admission.   See  Rogers v.  Raymark Indus.,
                                                                 
Inc.,  922 F.2d 1426, 1429  (9th Cir. 1991)  (admission of demon-
    
strative  evidence  entrusted to  trial  court  discretion).   At
trial,  Bijhouwer  challenged the  accuracy  of  the van  Dissell
measurements upon  which Exhibit 73  was predicated.   See United
                                                                 
States v. Myers,  972 F.2d  1566, 1579 (11th  Cir. 1992)  (noting
               
that  admission turns  on whether  there is  foundation testimony
that demonstrative evidence is "fair" and "accurate" depiction of
original), cert. denied, 113 S.  Ct. 1813 (1993); Nichols Constr.
                                                                 
Corp  v. Cessna Aircraft  Co., 808 F.2d 340,  353 (5th Cir. 1985)
                             
(same).  Finally, relevant  portions of Exhibits 91 and  91A were
read into  the trial  record.  See  Fed. R. Civ.  P. 61;  Fed. R.
                                  
Evid. 403.

                                35

determining  that  "a  custom-generated  duty  to  supervise  and

inspect  does not transfer to the ship  owner a duty to eradicate

dangers  reasonably  known  to  and managed  by  the  stevedore."

Keller, No. 81-549-SD, slip  op. at 14 (citing La  Martina v. Pan
                                                                 

Ocean  Shipping Co.,  Ltd.,  815 F.  Supp.  878, 880-81  (D.  Md.
                          

1993)).

          A vessel owner's duty  of care normally ceases  once it

has discharged its "turnover" duties and the stevedore-employer's

cargo operations have begun.   Nonetheless, the Supreme Court has

suggested  three settings  in which an  owner might  remain under
                                                   

some  "continuing" duty  to  monitor, supervise,  or inspect  the

vessel  for  hazards   developing  after  stevedoring  operations
                                 

commence.  First, the vessel owner might remain under such a duty

were it to retain actual physical control or custody of a portion

of the vessel, or  participate in stevedoring operations.   Scin-
                                                                 

dia, 451 U.S. at 167.  Keller concedes that these conditions were
   

not met.  Second, a  duty to intervene might attach in  the event

the vessel  owner were to  acquire actual knowledge  that "unsafe
                                                   

conditions"  had developed  in  the vessel's  appurtenances since
                          

turnover, that the stevedore-employer will not address the unsafe

condition, and  that the stevedore's  decision not to  remedy the
              

developing  hazard was  "obviously  improvident"  in the  circum-

stances.   Id.  at 174-75.   Third,  even absent  actual control,
              

participation or  knowledge, a post-"turnover" duty  may arise if

the vessel owner was  obligated, by contract, statute  or custom,

                                36

to monitor  stevedoring operations  for the purpose  of detecting

and remedying unsafe conditions.  Id. at 172.  
                                     

          Keller's  "continuing  duty" claim  was founded  on the

contention  that the defendant vessel  owner had either actual or

constructive knowledge  of  an unreasonably  dangerous  condition

during cable  loading operations.   However, he does  not suggest
      

that the basic structure or  design of the Tank 4  ladder changed
                                                                 

after cable loading began (e.g., ladder rungs displaced, loosened
                               

or fractured).   Therefore, the defendant could  have breached no

continuing  duty  of care  to  Keller, since  the  district court
          

supportably found that the Tank 4 ladder configuration created no

"unreasonable"  hazard ab initio.   See Scindia, 451  U.S. at 172
                                               

("We are of the view that . . . the shipowner has no general duty

by way of supervision or  inspection to exercise reasonable  care

to discover  dangerous conditions that develop  [i.e., a malfunc-
                                              

tioning winch] within the  confines of the cargo  operations that

are assigned  to  the stevedore.");  Martinez,  903 F.2d  at  611
                                             

("[T]he  alleged unsafe condition  [employees working on "unsafe"

platform] did not develop during cargo operations; it was  either

safe or unsafe at the time the cargo operations began . .  . .");

Pluyer v. Mitsui  O. S. K. Lines, Ltd., 664  F.2d 1243, 1246 (5th
                                      

Cir. 1982)  (noting "different  situation" than in  Scindia where
                                                           

the  "case  involves  the  vessel's liability  for  hazards  that

antedate or  are coincident with the commencement of cargo opera-
        

tions").

                                37

          Keller intimates that the  relevant "change" or "devel-

opment" which  would have been  discovered had defendant  met its

alleged continuing duty to monitor and intervene was  the failure

of Simplex cable loaders to use the Tank 4 ladder in the intended

manner.  Thus, Keller would  interpret the district court  ruling

   that  "a custom-generated duty  to supervise and  inspect does

not  transfer to  the  ship owner  a  duty to  eradicate  dangers

reasonably known to and  managed by the stevedore"     as holding

that a vessel owner can never be duty-bound to intervene  once an
                             

on-board danger (the risk that longshore workers might resort  to

the "over" and "between" methods  of egress) becomes "obvious" to

the stevedore. 

          We cannot  subscribe to Keller's reasoning.   First, as

already noted,  we  discern no  indication that  the trial  court

credited evidence  that the two alternate methods of exiting Tank

4 were not  reasonably safe.  Second, even if  the district court

had found these  other methods of egress "unsafe,"  initially the
                                                             

vessel  owner could  rely  on Simplex  to  manage such  "obvious"

defects, unless and until it appeared that Simplex's decision not

to  take  remedial measures  (warnings  or  railing removal)  was

"obviously improvident"  under the circumstances.  Keller conced-

ed, however, that  Simplex, which plainly had actual or construc-

tive notice as to how its longshore workers were exiting Tank  4,

never  received an employee complaint about the Tank 4 ladder and
     

that no accident  ever occurred  on the ladder  either before  or
                      

after  the Keller incident.   Thus, evidence  presented by Keller

                                38

did not begin  to establish defendant's  actual knowledge of  the

alleged "hazard" on the  part of the defendant vessel  owner, let

alone any obvious improvidence on  the part of Simplex.  For  the

same  reason, even if the defendant vessel owner had been under a

contractual or  custom-generated duty to  monitor and  intervene,

Keller failed to establish a breach.11 

                               III

                            CONCLUSION
                                      

          Given the  exacting standards of care  incumbent upon a

stevedore under the LHWCA, and  the supportable trial court find-

ings, we are left  with nothing approaching a "definite  and firm

conviction  that a mistake has  been committed."  Holmes Transp.,
                                                                 

Inc., 983 F.2d at 1129.   Once the trier of fact  determined that
    

the  Tank 4 ladder was "safe," its design compatible with "appli-

cable"  maritime  safety  standards, and  any  potential  hazards

sufficiently "obvious" to Simplex longshore  workers, it followed

                    

     11Keller  argues that  the  contract between  defendant  and
Simplex unambiguously provided that defendant, not Simplex, would
                                                          
bear  primary responsibility for ongoing "safety" inspections and
             
modifications  to  the HUDDELL's  work areas  following turnover.
Keller points to a contract provision barring Simplex from making
unilateral  structural alterations  to  the HUDDELL.   From  this
          
premise, he contends that Simplex was compelled to use the Tank 4
ladder  in existence  at  turnover.   We  do not  agree.   First,
contrary to  the trial  court's alternate finding,  this argument
presumes that the  ladder was  "unsafe."    Second, the  contract
contemplated that Simplex would  bear the primary role in  deter-
                                                 
mining whether  modifications were needed, even  if defendant was
to be consulted before "major" modifications were undertaken.  In
any event,  this contention falls  far short  of demonstrating  a
contractual  duty on the part  of the vessel  owner to monitor in
                                                              
the first instance. 
                  

                                39

inexorably that the vessel owner was entitled to rely on Simplex,

as an "expert and experienced"  stevedore, to act with reasonable

care in  supervising its workers  in their  interaction with  and

avoidance  of  any such  "obvious"  hazards on  board  the vessel

during  cargo loading  operations.   Any relevant  "hazard" could

have  been averted  by  Simplex in  various  ways, including  the

permanent removal of the safety railings at the top of the Tank 4

ladder, a  warning on the ladder as to safe methods of egress, or

simple instruction of its longshore workers. 

          The judgment is affirmed.  The parties shall bear their
                                                                 

own costs.
         

                                40