| Navy | The Soviet Navy |
| Type | Submarine |
| Class | M (Malyutka) |
| Pennant | |
| Mod | 3rd group (Type XII) |
| Built by | Sudomekh (Leningrad, U.S.S.R.) / Yard 196 |
| Ordered | |
| Laid down | 27 Jun 1936 |
| Launched | 9 Oct 1937 |
| Commissioned | 22 Jun 1938 |
| Lost | Aug 1942 |
| History | Northern fleet. M-173 departed base on 6 August 1942 but she did not return as expected on 18 August. She was most likely mined and sunk off Vardo, Norway in this time period. |
We don't have any commands listed for USSR M-173
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Notable events involving M-173 include:
16 Mar 1942
M-173 fires a torpedo against ' what is identified as ' a merchant of 3500 tons off the Varangerfjord. The torpedo misses its target.
7 Apr 1942
M-173 fires two torpedoes against ' what is identified as ' a merchant of 7000 tons off the Persfjord. The torpedoes missed their target.
14 Apr 1942
M-173 fires two torpedoes against ' what is identified as ' a tanker of 10000 tons off Sturskaer. The torpedoes missed their target.
24 Apr 1942
M-173 torpedoed and sank the German merchant Blankenese (3236 GRT, former French Ange Schiaffino) north of the Persfjord in position 70°53'N, 30°78'E.