[A] German U-boat has been visited by marine archaeologists working off the shores of Texas in the Gulf of Mexico.
[I]n addition to marauding merchant shipping in the North Atlantic, Nazi naval commanders dispatched 22 U-boats to the Gulf of Mexico.
Historians claim that U-boats sank at least 50 American ships in the Gulf — including one in the very mouth of the Mississippi River. The U.S. Navy was only able to sink one U-boat in the Gulf.
Via io9 for the full article and additional photos.