| Navy | The Soviet Navy |
| Type | Submarine |
| Class | M (Malyutka) |
| Pennant | |
| Mod | 3rd group (Type XII) |
| Built by | Marti Yard (Nikolayev, U.S.S.R.) / Yard 198 |
| Ordered | |
| Laid down | 28 May 1940 |
| Launched | 19 Aug 1941 |
| Commissioned | 10 Apr 1942 |
| Lost | Nov 1942 |
| History | Northern fleet. Completed at Molotovsk at Yard No.402. |
We don't have any commands listed for USSR M-121
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