| Navy | The Soviet Navy |
| Type | Submarine |
| Class | S (Stalinec) |
| Pennant | |
| 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 |
| Loss position | |
| 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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Noteable 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 attacks a German convoy and torpedoes and sinks the German tanker Eurostadt (1118 GRT) off the Kongsfjord in position 70º48'N, 29º34'E. The German merchant Wartheland (3676 GRT, former Soviet Arija) is hit by a dud torpedo during the same attack and was lightly damaged. (see map)
17 Jul 1943
S-56 torpedoes and sinks the German minesweeper M 346 (551 tons) west of the Tanafjord in position 71º07'N, 28º22'E. S-56 misses the German auxiliary minelayer Ostmark in the same attack. (see map)
19 Jul 1943
S-56 torpedoes and sinks 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 attacks 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 spottted and driven off by gunfire from the German escorts NKi 10 and UJ 1206.
31 Jan 1944
S-56 torpedoes and sinks the German merchant Heinrich Schulte (5056 GRT) west of the Tanafjord in position 71º08'N, 28º17'E. (see map)
4 Mar 1944
S-56 attacks a German convoy of the Tanafjord in position 71º04'N, 28º34'E. No hits were obtained and one torpedo failed to leave it's tube. The attack was made at 25 meters depth on sonar. (see map)
15 Jul 1944
S-56 attacks a German convoy off the Syltefjord in position 70º38'N, 30º36'E. S-56 fires four torpedoes but no hits were obtained. (see map)
24 Sep 1944
S-56 attacks a German convoy off Nordkyn with four torpedoes. No hits were obtained
26 Sep 1944
S-56 attacks the German minesweepers M 31 and M 251 off Nordkyn. No hits were obtained and S-56 was damaged during a counter-attack.