German submarine U-3523 was a Type XXI U-boat (one of the "Elektroboote") of Nazi Germany's Kriegsmarine, built for service in World War II. She was ordered on 6 November 1943, and was laid down on 7 October 1944 at F Schichau GmbH, Danzig, as yard number 1668. She was launched on 14 December 1944, and commissioned under the command of Oberleutnant zur See Willi Müller on 23 January 1945.[1]
Like all Type XXI U-boats, U-3523 had a displacement of 1621t when at the surface and 1819t while submerged. She had a total length of 76.7m (251.6feet) (o/a), a beam of 8m (26feet), and a draught of 6.32m (20.73feet). The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing 4000lk=onNaNlk=on, two Siemens-Schuckert GU365/30 double-acting electric motors each providing 5000PS, and two Siemens-Schuckert silent running GV232/28 electric motors each providing 226PS.
The submarine had a maximum surface speed of and a submerged speed of . When running on silent motors the boat could operate at a speed of . When submerged, the boat could operate at for ; when surfaced, she could travel at . U-3523 was fitted with six 53.3cm (21inches) torpedo tubes in the bow and four 2sp=usNaNsp=us C/30 anti-aircraft guns. She could carry twenty-three torpedoes, or seventeen torpedoes and twelve mines. The complement was five officers and fifty-two men.
U-3523 had been sailing on the surface with U-534 and U-3503 just north of the cease-fire line when it was sunk by depth charges from a British B-24 Liberator of 86 Squadron/G RAF about north of Skagen Horn, in the Skagerrak on 6 May 1945. All 58 crewmen were lost.
The wreck was thought to be located at 57.8667°N 59°W, however, in April 2018, it was found by Sea War Museum Jutland, Thyborøn, further west. The wreck lies at a depth of . The entire fore part of the boat is buried in the seabed while its stern rises above the bottom.[2]