| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Built by | Marti Yard (Nikolayev, U.S.S.R.) / Yard 198 |
| Ordered | |
| Laid down | 5 Oct 1937 |
| Launched | 22 Feb 1939 |
| Commissioned | 19 Jun 1940 |
| End service | 14 Mar 1955 |
| Loss position | |
| History | Black Sea fleet. Decommissioned on 14 March 1955. |
We don't have any commands listed for USSR S-31
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Noteable events involving S-31 include:
21 Sep 1942
S-31 fires two torpedoes against ' what is identified as ' a merchant of 1500 tons south of Yalta, Crimea. Both torpedoes missed their target.
22 Sep 1942
S-31 fires two torpedoes against the German barge F-359 south of Yalta, Crimea. Both torpedoes missed their target.
17 Oct 1943
S-31 fires four torpedoes against the German barge F 418 some 23 nautical miles south-west of Yevpatoriya, Crimea in position 44º59'N, 32º56'E. The torpedoes missed their target. (see map)
18 Oct 1943
S-31 fires four torpedoes against ' what is identified as ' a merchant of 5000 tons some 30 nautical miles south-east of Yevpatoriya, Crimea in position 44º58'N, 32º46'E. Both torpedoes missed their target. (see map)
9 Dec 1943
S-31 torpedoes and sinks the German barge F 580 (155 BRT) some 20 nautical miles east of Ak-Mechet, Crimea in position 45º29'N, 32º19'E. (see map)
13 Apr 1944
S-31 fires 4 torpedoes against the Romanian merchant Ardeal (5695 BRT) in the Black Sea some 105 nautical miles east-south-east of Constanta, Romania in position 43.38N, 31.00E. All four torpedoes missed their target. (see map)