During World War I, U-110 was launched on July 28, 1917, and commissioned into the Kaiserliche Marine on September 25, 1917.
The second U-110 was a Type IXB submarine of the Kriegsmarine. Her keel was laid down February 1, 1940 by [AG Weser]?, of [Bremen, Germany]?. She was commissioned November 21, 1940 with Kapitänleutnant Fritz-Julius Lemp in command. Lemp commanded her for her entire career.
The second U-110 conducted two patrols, sinking three ships totalling 10,149 tons and damaging two others totalling 8,675 tons. On March 23, 1941, her 105mm deck gun exploded during firing, wounding three men. On [9 May]?, 1941, she was captured.
U-110 was attacking a convoy along with U-201? in the North Atlantic south of Iceland when Lemp left his periscope up too long. The escort [HMS Aubretia]? spotted it and began dropping depth charges. U-110 survived the first attacks but when [HMS Bulldog]? and [HMS Broadway]? joined the attack, U-110 was forced to surface. Bulldog set course to ram. Lemp saw her charge and ordered "Abandon Ship," assuming that since the boat was going to be rammed and sunk, its secrets were safe. At the same time, however, Bulldog's commander realized that a capture might be possible and changed course, avoiding the collision. Lemp, in turn, saw that the boat was not sinking and attempted to swim back to it to destroy the secret material. He was never seen again. He may have shot in the water by a British sailor, but his fate is unknown. Including Lemp, 15 men were killed in the action and 32 captured.
Bulldog's crew stripped U-110 of everything portable on the spot, including her secret documents and Enigma cipher machine. U-110 was taken in tow back toward England, but to ensure that the Germans would not learn that she had been captured and change the cipher system, the Admiralty send orders that the boat be scuttled at sea.
The movie "U-571" was partially inspired by the capture of U-110.
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