Credit for sinking U-boat 166 was instead given to a Coast Guard patrol plane in an attack two days later and 140 miles to the west. Yet no U-boat was ever found after the Coast Guard attack.

Germany's U-505 submarine was the 1st warship captured by the US Navy in over a century and top secret during World War II.

Herbert G. Claudius thought he might have sunk a U-Boat off the coast of Louisiana in 1942. He thought so for decades, in fact, but the U.S. Navy couldn't find evidence to back up Claudius' claim.