S-7 was a Stalinets-class submarine of the Soviet Navy. Her keel was laid down by Krasnoye Sormovo in Gorkiy on 14 December 1936. She was launched on 5 April 1937 and commissioned on 30 June 1940 in the Baltic Fleet. During World War II, the submarine was under the command of Captain Sergei Prokofievich Lisin and took part in the Soviet submarine Baltic Sea campaign in 1942. S-7 scored victories, but was sunk in action.

Quick Facts History, General characteristics ...

S-7 in Baltic Sea, circa 1941
History
Soviet Union
Name	S-7
Builder	Krasnoye Sormovo, Gorkiy
Laid down	14 December 1936
Launched	5 April 1937
Commissioned	30 June 1940
Fate	Sunk by Vesihiisi on 21 October 1942
General characteristics
Class and type	Soviet S-class submarine
Displacement	840 long tons (853 t) surfaced 1,050 long tons (1,067 t) submerged
Length	77.8 m (255 ft 3 in)
Beam	6.4 m (21 ft 0 in)
Draught	4.4 m (14 ft 5 in)
Propulsion	2 × diesels 2,000 hp (1,491 kW) each 2 × electric motors 550 hp (410 kW) each 2 × shafts
Speed	19.5 knots (36.1 km/h; 22.4 mph) surfaced 9 knots (17 km/h; 10 mph) submerged
Test depth	100 m (330 ft)
Complement	50 officers and men
Armament	6 × 21 in (530 mm) torpedo tubes (4 forward, 2 aft) 12 × torpedoes 1 × 100 mm (4 in) gun 1 × 45 mm (2 in) cannon

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The submarine made all her victories in summer 1942, having some success against the German-Swedish iron ore shipping lines (the main target of 1942 Soviet submarine campaign).

More information Date, Ship ...

Ships sunk by S-7^[1]

Date	Ship	Flag	Tonnage	Notes
9 July 1942	Margareta		1,272 GRT	freighter (torpedo)
11 July 1942	Lulea		5,611 GRT	freighter (torpedo)
30 July 1942	Kathe		1,599 GRT	freighter (torpedo)
5 August 1942	Pohjanlahti		682 GRT	freighter (deck gun)
Total:			9,164 GRT

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On 27 July 1942 S-7 also attacked the German merchant Ellen Larsen (1,938 GRT): the torpedoes missed and S-7 opened fire with her gun. As result the merchant was driven ashore.^[1]

While attempting a new campaign (after the successful summer one), S-7 was attacked, torpedoed and sunk by the Vesihiisi.

Four crewmembers were saved and captured, including the commander Lisin. Commander Lisin was believed killed in action and was awarded post-mortem the distinction, Hero of the Soviet Union. Once Finland signed an armistice with the Allies in 1944, Lisin was freed and was sent by the Soviets to an NKVD special camp. However accusations against him were dropped (he kept the title of Hero) and became a military instructor at an officer school.^[2]

In July 1998, the wreck of S-7 was found. The official data of war archives alleges that S-7 was torpedoed in Finnish waters, but the submarine was found in Swedish territorial waters – east of Söderarm in Stockholm's northern archipelago.^[3]