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German submarine U-557
''U-557'' was a Type VIIC U-boat built for Nazi Germany's ''Kriegsmarine'' for service during World War II. She was laid down on 6 January 1940, launched on 22 December 1940 and commissioned on 13 February 1941. ''Oberleutnant zur See'' Ottokar Paulssen was in command throughout her career. For her first three war patrols her 2nd Watch Officer was Herbert Werner, who later wrote the memoir of U-boat service, ''Iron Coffins''. She sank six merchant ships and one warship, a total of almost over four patrols.〔
She was rammed and sunk by mistake by an Italian torpedo boat on 16 December 1941 west of Crete.
==Design==
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. ''U-557'' had a displacement of when at the surface and while submerged. She had a total length of , a pressure hull length of , a beam of , a height of , and a draught of . The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of for use while submerged. She had two shafts and two propellers. The boat was capable of operating at depths of up to .
The submarine had a maximum surface speed of and a maximum submerged speed of . When submerged, the boat could operate for at ; when surfaced, she could travel at . ''U-557'' was fitted with five torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one , 220 rounds, and an anti-aircraft gun. The boat had a complement of between forty-four and sixty.
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