German submarine U-2513 was a Type XXI U-boat of Nazi Germany's Kriegsmarine, that was operated by the United States Navy for several years after World War II.
USS U-2513 off Key West in October 1946
Type XXI submarines were a class of German diesel–electric Elektroboot submarines designed during the Second World War. One hundred and eighteen were completed, with four being combat-ready. During the war only two were put into active service and went on patrols, but these were not used in combat.
U-2540 in wartime configuration and exhibited at the Maritime Museum in Bremerhaven. It is the only floating example of a Type XXI U-boat.
Construction consisted of nine prefabricated sections
U.S. Navy diagram of a Type XXI U-boat. Note the teardrop-shaped fairing for the large hydrophone array beneath the bow and the wasp-waist pressure hull. The large sonar array and its housing did slow the boat down, but its placement and size allowed for a very sensitive system to be installed, and gave it near-360 degree coverage around the submarine.
Three Type XXI U-boats and one Type VII U-boat moored at Bergen, Norway (May 1945). The Type XXI in the middle is U-2511