German World War II submarine
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.
Design.
Like all Type XXI U-boats, "U-3523" had a displacement of when at the surface and while submerged. She had a total length of (o/a), a beam of , and a draught of . The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing , two Siemens-Schuckert GU365/30 double-acting electric motors each providing , and two Siemens-Schuckert silent running GV232/28 electric motors each providing .
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 torpedo tubes in the bow and four 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.
Sinking.
"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 , 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.
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