43 U.S.C. § 1844: Burden of proof

the commercial fishing vessel was being used for fishing and was located in an area affected by Outer Continental Shelf activities; 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 fifteen days after the date on which the vessel first returns to a port after discovering such damages; there was no record on the latest nautical charts or Notice to Mariners in effect at least 15 days prior to the date such damages were sustained that such material, equipment, tool, container, or other item existed where such damages occurred, except that in the case of damages caused by a pipeline, the presumption established by this section shall obtain whether or not there was any such record of the pipeline on the damage date; and there was no proper surface marker or lighted buoy which was attached or closely anchored to such material, equipment, tool, container, or other item.