| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Mod | 2nd group (Type IX-modified) |
| Built by | Krasnoye Sormovo (Gorkiy, U.S.S.R) / Yard 112 |
| Ordered | |
| Laid down | 20 Oct 1937 |
| Launched | 20 Apr 1938 |
| Commissioned | 24 Jul 1941 |
| Lost | Aug 1943 |
| History | Baltic fleet. Most likely lost on or after 1 August 1943 north off Naissaar Island. Possibly due to mines of the Nashorn minefield. All hands (46 men) lost. |
We don't have any commands listed for USSR S-12
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Notable events involving S-12 include:
30 Sep 1942
S-12 fired torpedoes against ' what is identified as ' a German Schlesien-class battleship off Klaipeda, Lithuania. S-12 claimed a sinking. In reality a small German auxiliary minesweeper was attacked but missed !!!
5 Oct 1942
S-12 fires two torpedoes against ' what is identified as ' a merchant of 8000 tons off Libau. The torpedoes missed their target.
6 Oct 1942
S-12 fires four torpedoes against ' what is identified as ' a merchant south-west of Klaipeda, Lithuania. The torpedoes missed and the target was engaged with gunfire but was not hit. The ship attacked was the small German auxiliary patrol vessel V 1707 / Viking IV.
21 Oct 1942
S-12 torpedoed and damaged the German merchant Sabine Howald (5956 GRT) about 10 nautical miles south-south-west of Libau in position 56°21'N, 20°55'E.
27 Oct 1942
S-12 torpedoed and damaged the German merchant Malgache (former French, 6903 GRT) about 20 nautical miles north of Libau in position 56°52'N, 20°59'E. The Malgache is grounded to prevent her from sinking and later salvaged. The Swedish merchant Gordias (1632 BRT) is missed in the same attack.