| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| Mod | 2nd group (Type IX-modified) |
| Built by | Dalzavod (Vladivostok, U.S.S.R.) / Yard 202 |
| Ordered | |
| Laid down | 24 Nov 1936 |
| Launched | 25 Dec 1939 |
| Commissioned | 20 Oct 1941 |
| End service | 14 Mar 1955 |
| History | Pacific fleet, later Northern fleet. Decommissioned on 14 March 1955. |
We don't have any commands listed for USSR S-56
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Notable events involving S-56 include:
10 Apr 1943
S-56 fires two torpedoes against ' what is identified as ' a merchant of 8000 tons off the Tanafjord. Both torpedoes missed their target.
14 Apr 1943
S-56 fires four torpedoes against ' what is identified as ' a merchant of 6000 tons off the Kongsfjord. All four torpedoes missed their target. The German merchant Detlef (1809 GRT) reported being missed by 10 meters.
17 May 1943
S-56 attacked a German convoy and torpedoed and sank the German tanker Eurostadt (1118 GRT) off the Kongsfjord in position 70°48'N, 29°34'E. The German merchant Wartheland (3676 GRT, former Soviet Arija) is hit by a dud torpedo during the same attack and was slightly damaged.
17 Jul 1943
S-56 torpedoed and sank the German minesweeper M 346 (551 tons) west of the Tanafjord in position 71°07'N, 28°22'E. S-56 misses the German auxiliary minelayer Ostmark in the same attack.
19 Jul 1943
S-56 torpedoed and sank the German auxiliary patrol vessel NKi 09 / Alane (466 GRT, former British ASW trawler HMS Warwickshire) off the Tanafjord near Gamvik.
20 Jan 1944
S-56 attacked a German convoy off the Tanafjord but fails to hit any ships.
23 Jan 1944
S-56 tries to attack a German convoy off Nordkyn. S-56 attacked on the surface but was spotted and driven off by gunfire from the German escorts NKi 10 and UJ 1206.
31 Jan 1944
S-56 torpedoed and sank the German merchant Heinrich Schulte (5056 GRT) west of the Tanafjord in position 71°08'N, 28°17'E.
4 Mar 1944
S-56 attacked a German convoy of the Tanafjord in position 71°04'N, 28°34'E. No hits were obtained and one torpedo failed to leave it's tube. The attack was made at 25 meters depth on sonar.
15 Jul 1944
S-56 attacked a German convoy off the Syltefjord in position 70°38'N, 30°36'E. S-56 fires four torpedoes but no hits were obtained.
24 Sep 1944
S-56 attacked a German convoy off Nordkyn with four torpedoes. No hits were obtained
26 Sep 1944
S-56 attacked the German minesweepers M 31 and M 251 off Nordkyn. No hits were obtained and S-56 was damaged during a counter-attack.