German submarine U-793
German submarine "U-793" was a Type XVIIA U-boat of Nazi Germany's "Kriegsmarine" during the Second World War. She was one of a small number of U-boats fitted with Hellmuth Walter's high test peroxide propulsion system, which offered a combination of air-independent propulsion and high submerged speeds. She spent the war as a trials vessel and was scuttled on 4 May 1945 in the Audorfer See, near Rendsburg. Construction. The "U-793" was laid down on 1 December 1942 at the Blohm & Voss, Hamburg, as yard number 456. She was launched on 4 March  1944 and commissioned under the command of "Oberleutnant zur See" Günther Schauenburg on 24 April 1944. When she was completed, the submarine was long overall, with a beam of and a draught of . She was assessed at submerged. The submarine was powered by one Deutz SAA 8M517 supercharged 8-cylinder diesel engine producing a total of for use while surfaced and one Walter gas turbines producing a total of for use while submerged. She had one shaft and one propeller. The submarine had a maximum surface speed of and a maximum submerged speed of using the HTP drive. When submerged , the U-boat could operate for at on her HTP system and when surfaced, she could travel at . The submarine was fitted with two torpedo tubes (All fitted at the bow) and four torpedoes. The boat had a complement of 12 men. Service history. "U-793" did not undertake any war patrols and was instead assigned as a trials boat at first to the 8th U-boat Flotilla, followed by the 5th U-boat Flotilla. The "U-793" was scuttled on 4 May 1945 at 1.30am in the Audorfer See (Kaiser Wilhelm Canal), near Rendsburg during Operation Regenbogen. Wreck. The wreck of  U-793 lay at until 26 May 1945, when she was lifted by the British and taken to the Howaldtswerke in Kiel to be examined. She was first raised as a British prize and used for trials, but was soon torn down for parts and finally scrapped.