U-110
The U-boat from which the British recovered a vital Enigma encryption device and accompanying documentation in May 1941, allowing the first critical Allied breakthrough in reading U-boat radio communications during World War II. (For more on the breaking of the Enigma, see Decoding Nazi Secrets.) U-110's captain, KL Fritz-Julius Lemp, had sunk the first Allied merchant ship of the war, the British liner Athenia, while in command of U-30.

Type: IX B
Built: AG Weser, Bremen
Keel laid: 1 February 1940
Launched: 25 August 1940
Commissioned: 21 November 1940
Commander: KL Fritz-Julius Lemp
Fate: Badly damaged in a convoy action 9 May 1941 by depth charges from corvette HMS Aubretia and forced to the surface. The crew abandoned ship, but before she could sink, a boarding party from destroyer HMS Bulldog went aboard, recovered the Enigma machine and other materials, and set up a towline to tow her into captivity. U-110 foundered the next day while still in tow.