Pub. L. 95-372, tit. IV, sec. 404
burden of proof
burden of proof Sec. 404. With respect to any claim for damages filed pursuant to this title, there shall be a presumption that such claim is valid if the claimant establishes that— (1) the commercial fishing vessel was being used for fishing and was located in an area affected by Outer Continental Shelf activities; (2) a report on the location of the material, equipment, tool, container, or other item which caused such damages and the nature of such damages was made within five days after the date on which such damages were discovered; (3) there was no record on nautical charts or the Notice to Mariners on the date such damages were sustained that such material, equipment, tool, container, or other item existed in such area; and (4) there was no proper surface marker or lighted buoy which was attached or closely anchored to such material, equipment, tool, container, or other item.