German World War II submarine
German submarine "U-710" was a Type VIIC U-boat of Nazi Germany's "Kriegsmarine" during World War II. She had an extremely short career, only conducting one patrol in April 1943 and attacking no ships. Just nine days after starting her first patrol, she was sunk by a B-17 Flying Fortress with the loss of all hands.
Design.
German Type VIIC submarines were slight modifications of their Type VIIB predecessors; the length and weight were slightly larger and an active sonar was added. "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 &amp; 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 deck gun, 220 rounds, and two twin anti-aircraft guns. The boat had a complement of between forty-four and sixty.
Service.
Construction and training.
"U-710" was ordered on 15 August 1940 and laid down on 4 June 1941 at H. C. Stülcken Sohn, Hamburg, as yard number 774. The submarine was launched on 12 May 1942 and commissioned on 2 September 1942 under the command of "Oberleutnant zur See" Dietrich von Carlewitz. Upon commissioning, "U-710" was attached to the 5th U-boat Flotilla for training.
First patrol and sinking.
On 1 April 1943, "U-710" completed training and was attached to the 7th U-boat Flotilla for active service. Fourteen days later, the submarine departed from Kiel on her first service patrol, sailing through the North Sea and into the North Atlantic Ocean.
On 24 April 1943, while the submarine was sailing in the North Atlantic south of Iceland, "U-710" was spotted on the surface by a British B-17 Flying Fortress of No. 206 Squadron RAF, patrolling in support of convoy ONS 5. The bomber attacked through heavy anti-aircraft fire and dropped six shallow depth charges, which seemed to lift the boat out of the water'. Shortly afterward, a second attack by the B-17 sank the U-boat at . The B-17 crew reported seeing some twenty-five German sailors swimming near the wreck of "U-710", but all 49 hands were lost.
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