German submarine U-3515

German submarine U-3515 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 27 August 1944 at F Schichau GmbH, Danzig, as yard number 1660. She was launched on 4 November 1944, and commissioned under the command of Oberleutnant zur See Fedor Kuscher, on 14 December 1944.

Design
Like all Type XXI U-boats, U-3515 had a displacement of 1621 t when at the surface and 1819 t while submerged. She had a total length of 76.70 m (o/a), a beam length of 8 m, and a draught length of 6.32 m. The submarine was powered by two MAN SE supercharged six-cylinder M6V40/46KBB diesel engines each providing 4000 PS, two Siemens-Schuckert GU365/30 double-acting electric motors each providing 5000 PS, and two Siemens-Schuckert silent running GV232/28 electric motors each providing 226 PS.

The submarine had a maximum surface speed of 15.6 kn and a submerged speed of 17.2 kn. When running on silent motors the boat could operate at a speed of 6.1 kn. When submerged, the boat could operate at 5 kn for 340 nmi; when surfaced, she could travel 15500 nmi at 10 kn. U-3515 was fitted with six 53.3 cm torpedo tubes in the bow and four 2 cm anti-aircraft guns. She could carry twenty-three torpedoes or seventeen torpedoes and twelve mines. The complement was five officers and fifty-two men.

Service history
On 9 May 1945, U-3515 surrendered at Horten, Norway. She was later transferred to Oslo, 18 May 1945, then to Scapa Flow, Scotland, 3 June, arriving 6 June, and finally Lisahally, Northern Ireland on 8 June 1945, arriving 9 June 1945.

Post war service
The TNC allocated U-3515 to the Soviet Union. On 2 February 1946, she arrived in Libau, Latvia, as British N-class N30. On 13 February 1946, the Soviet Navy allocated her to the Baltic Fleet. She was renamed B-30 on 9 June 1949 then sent to the reserve fleet on 29 December 1955. B-30 was redesignated on 18 January 1956, as a floating submarine battery recharging station PZS-35. Redesignated as test hulk B-100 2 July 1958, until finally being struck from the Soviet Navy on 25 September 1959, and broken up for scrap 30 November 1959.