|Ordered||6 Nov 1943|
|Laid down||27 Aug 1944||F Schichau GmbH, Danzig (werk 1660)|
|Launched||4 Nov 1944|
|Commissioned||14 Dec 1944||Oblt. Fedor Kuscher|
|Successes||No ships sunk or damaged|
Surrendered on 9 May 1945 at Horten, Norway (Waller & Niestlé, 2010).
Transferred to Oslo 18 May
Allocated to the USSR by the TNC. Arrived Libau (Latvia) on 2 Feb 46 with RN Pennant No: N.30. Allocated to the Baltic Fleet on 13 Feb 46. Renamed B-30 on 9 Jun 49. To reserve on 29 Dec 55. Designated as floating submarine battery recharging station PZS-35 on 18 Jan 56. Re-designated as test hulk B-100 on 2 Jul 58. Struck from Soviet Navy list on 25 Sep 59. Sold for scrap on 30 Nov 59 and broken-up.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-3515 did not suffer any casualties (we know of) until the time of her loss.