German submarine U-747
German submarine "U-747" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" built for service during World War II. Her keel was laid down on 19 August 1942 by Schichau-Werke of Danzig. She was commissioned on 17 July 1943 with "Tenente di vascello" Roberto Rigoli in command. Design. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-747" 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 AEG GU 460/8–27 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-747" was fitted with five torpedo tubes (four fitted at the bow and one at the  stern), fourteen torpedoes, one SK C/35 naval gun, 220 rounds, and two twin C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.