| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Mod | 2nd group (Type IX-modified) |
| 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 |
| History | Black Sea fleet. Decommissioned on 14 March 1955. |
We don't have any commands listed for USSR S-31
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Notable 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 44°59'N, 32°56'E. The torpedoes missed their target.
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 44°58'N, 32°46'E. Both torpedoes missed their target.
9 Dec 1943
S-31 torpedoed and sank the German barge F 580 (155 BRT) some 20 nautical miles east of Ak-Mechet, Crimea in position 45°29'N, 32°19'E.
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°38'N, 31°00'E. All four torpedoes missed their target.