Captured incomplete on Slip No 3 in Danzig on 30 Mar 45
Schichau Shipyard Hull No: G-1683
Designated TS-8 on 12 Apr 45
Launched at Danzig in July 1945
Provisionally allocated to the Soviet Baltic Fleet
Moved to Libau (Latvia)
Inspected by TNC in Libau on 8 Oct 45 - still incomplete, with bomb damage and flooding in the forward section
Defined in TNC Report on 6 Dec 45 as an “unallocated submarine afloat”
Moved to Kronstadt in late 1945/early 1946
No evidence of completion, commissioning or use
Renamed R-4 on 8 Mar 47

Struck from Soviet Navy list on 28 Feb 48 and released for recovery Broken-up for scrap in 1948