| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Built by | Baltiyskiy Zavod (Leningrad, U.S.S.R.) / Yard 189 |
| Ordered | |
| Laid down | 3 Jan 1936 |
| Launched | 17 Sep 1936 |
| Commissioned | 30 Oct 1939 |
| Lost | 7 Jan 1945 |
| Loss position | 54.93N, 19.39E (See a map) |
| History | Baltic fleet. S-4 is most likely rammed and sunk during the night of on 6/7 Janaury 1945 by the German torpedo boat T 3 in Danzig Bay in position 54.93N, 19.39E. |
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Noteable events involving S-4 include:
25 Jun 1941
S-4 attacks ' what is identified as ' a merchant in the Baltic (Memel area). No hits were obtained.
10 Aug 1941
S-4 attacks ' what is identified as ' a tanker of 15000 tons off Polanga, Lithuania. Both torpedoes missed their target.
10 Aug 1941
S-4 fires 2 torpedoes against the German merchant Fritz Schoop (1598 BRT) some 30 nautical miles north of Rixhöft, Poland. Both torpedoes missed their target.
28 Jun 1942
S-4 fires two torpedoes against the German merchant Fritz Schoop (1598 BRT) some 30 miles north of Rixhöft, Poland. Both torpedoes missed their target.
24 Jul 1942
While on the return passage to base after a patrol off Danzig Bay, S-4 fires two torpedoes ' against what is identified as ' a merchant of 11000 tons north of Pakre, Estonia. Both torpedoes missed their target.
12 Oct 1944
At 0423 hours, S-4 torpedoes and sinks the German fishing vessel Taunus (218 BRT) off the Stolpebank in position 55º07'N, 17º85'E.
At 1401 hours, S-4 fires two torpedoes against ' what is identified as ' a merchant of 5000 tons in position 55º10'N, 17º64'E. Both torpedoes missed their target.
At 1430 hours, S-4 fires two torpedoes against ' what is identified as ' a merchant of 9000 tons. Both torpedoes missed their target. (see map)
13 Oct 1944
S-4 torpedoes and sinks the German tanker Terra (1533 BRT) some 30 nautical miles north-east of Leba, Poland in position 54º58'N, 18º19'E. (see map)
16 Oct 1944
S-4 fires 2 torpedoes against ' what is identified as ' a merchant of 15000 tons north of Danzig Bay in position 55º00'N, 19º00'E. Both torpedoes missed their target. (see map)
20 Oct 1944
S-4 fires 2 torpedoes against ' what is identified as ' a merchant of 8000 tons some 18 nautical miles north-east of Laba, Poland position 54º58'N, 17º52'E. Both torpedoes missed their target. (see map)
14 Dec 1944
S-4 attacks ' what are identified as ' two merchants with torpedoes off Ventspils, Latvia. All torpedoes fired missed their target.
22 Dec 1944
S-4 attacks a auxiliary patrol vessel with torpedoes off Pillau. All torpedoes fired missed their target.