| 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 | 17 Jun 1936 |
| Launched | 23 Jul 1937 |
| Commissioned | 11 Dec 1937 |
| Lost | Oct 1943 |
| History | Northern fleet. Went missing in early October 1943 off the Verangerfjord. Most likely mined in a German defensive minefield. M-172 had departed base on 1 October 1943. |
We don't have any commands listed for USSR M-172
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Notable events involving M-172 include:
21 Aug 1941
M-172 fires a torpedo against the German merchant Monsun (6950 GRT) off Linakhamari. The torpedo misses its target.
23 Aug 1941
M-172 fires a torpedo against the German hospital ship Alexander von Humboldt (686 GRT) north of Linakhamari in position 69°75'N, 31°50'E. The torpedo misses its target.
14 Sep 1941
M-172 fires a torpedo against ' what is identified as ' a merchant of 3000 tons, but is in fact the small Norwegian coaster Ornulf (80 GRT) off the Bokfjord. The torpedo misses its target.
12 Apr 1942
M-172 fires two torpedoes against ' what is identified as ' a merchant of 8000 tons in the Varangerfjord area. Both torpedoes missed their target.
15 Apr 1942
M-172 fires a torpedo against the German merchant Oleum (475 GRT) off the Varangerfjord near Ekkeroy. The torpedo missed its target.
20 Apr 1942
M-172 fires a torpedo against ' what is identified as ' a merchant of 5000 tons, but was in fact the German minesweeper M 251, off the Varangerfjord near Kiberg. The torpedo missed its target. After the attack M-172 was depth charged by M 251.
11 May 1942
M-172 fires two torpedoes against the German merchant Hartmut (2713 GRT) off the Varangerfjord. The torpedoes missed their target.
15 May 1942
M-172 fires a torpedo against the German hospital ship Birka (100 GRT) off the Varangerfjord. The torpedo missed its target.
16 May 1942
M-172 fires a torpedo against 'what is identified as ' a merchant of 6000 tons off the Syltefjord. The torpedo missed its target.
23 Jan 1943
M-172 fires two torpedoes against ' what is identified as ' a destroyer off the Syltefjord.
1 Feb 1943
M-172 torpedoed and sank the German auxiliary patrol vessel V 6115/Ostwind (560 GRT) off Kiberg, Norway in position 70°25'N, 31°02'E.
25 Feb 1943
M-171 fires two torpedoes against ' what is identified as ' a torpedo boat off the Varangerfjord. Both torpedoes missed their target.
18 Apr 1943
M-172 fires two torpedoes against the German merchant Adolf Binder (3515 GRT) off the Varangerfjord near Kiberg. Both torpedoes missed their target.
7 May 1943
M-172 fires two torpedoes against the German merchant Fasan (1075 GRT) off the Varangerfjord in the Vardo/Kiberg area. Both torpedoes missed their target.