DC2 Joshua Marks of the Atlantic Strike Team tests oil recovered from the Coimbra shipwreck. Coast Guard crews discovered a significant amount of oil in cargo and fuel tanks during onsite assessments of the Coimbra in May 2019. The Coimbra sank off the coast of Long Island after a German U-boat torpedoed the ship in January 1942. US Coast Guard photo by Lt. j.g. Rodion Mazin