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-709" 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. "U-709" had five patrols, from 12 August 1942 to 1 March 1944, during which she sank no ships. She was sunk by depth charges from the US destroyer escorts , , and while on patrol north of the Azores; all 52 crewmembers aboard died. "U-709" took part in 15 wolfpacks, namely:       German submarine U-710  German submarine "U-710" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. Ordered 15 August 1940, she was laid down 4 June 1941 and launched 12 May 1942. She had a relatively brief career from  2 September 1942 until 1 April 1943 as part of a training flotilla, then on active service from 1 April 1943 till 24 April 1943. During this time she was commanded by "Oberleutnant zur See" Dietrich von Carlowitz. German Type VIIC submarines were preceded by the shorter Type VIIB submarines. "U-710" 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 Garbe, Lahmeyer & Co. RP 137/c 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-710" 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.