| Navy | The Soviet Navy |
| Type | Submarine |
| Class | L (Leninec) |
| Pennant | |
| Mod | 2nd group (Type XI) |
| Built by | Marti Yard (Nikolayev, U.S.S.R.) / Yard 198 and Zavod imeni Leninskogo Komsomola (Komsomolsk-na-Amur, U.S.S.R.) / Yard 199 |
| Ordered | |
| Laid down | 10 Jun 1934 |
| Launched | 7 Nov 1936 |
| Commissioned | 9 Dec 1938 |
| End service | |
| History | Pacific fleet. |
We don't have any commands listed for USSR L-12
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Notable events involving L-12 include:
22 Aug 1945
While operating off the west coast of Hokkaido, Japan, L-12 torpedoed and sank the Japanese cable layer Ogasawara Maru (1403 GRT) in position 43°50'N, 141°13'E, torpedoed and damaged the Japanese auxiliary vessel Shinko Maru No.2 (2577 GRT) in position 44°15'N, 141°26'E and finally sank the Japanese merchant Taito Maru (887 GRT) in position 44°04'N, 141°27'E.