| Navy | The Soviet Navy |
| Type | Submarine |
| Class | L (Leninec) |
| Pennant | |
| 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 | |
| Loss position | |
| History | Pacific fleet. |
We don't have any commands listed for USSR L-12 ()
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Noteable events involving L-12 include:
22 Aug 1945
While operating off the west coast of Hokkaido, Japan, L-12 torpedoes and sinks the Japanese kablelayer Ogasawara Maru (1403 GRT) in position 43º50'N, 141º13'E, torpedoes and damages the Japanese auxiliary vessel Shinko Maru No.2 (2577 GRT) in position 44º15'N, 141º26'E and finally sinks the Japanese merchant Taito Maru (887 GRT) in position 44º04'N, 141º27'E. (see map)