Soviet K-class submarine

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K-21
Class overview
Name	K class
Operators	Soviet Navy
Preceded by	Soviet S class
Succeeded by	Zulu class
In service	1939–1959
In commission	1940–1959
Planned	12
Completed	11
Cancelled	1
Lost	5
Retired	7
Preserved	1
General characteristics
Type	Submarine
Displacement	1,490 tons surfaced 2,600 tons submerged
Length	97.65 m (320 ft 4 in)
Beam	7.4 m (24 ft 3 in)
Draught	4.51 m (14 ft 10 in)
Propulsion	2-shaft diesel electric, 8,400 hp (6,300 kW) diesel, 2,400 hp (1,800 kW) electric
Speed	surface – up to 22.5 knots (41.7 km/h; 25.9 mph) submerged – 10 knots (19 km/h; 12 mph)
Range	14,000 nautical miles (26,000 km; 16,000 mi) at 11 knots (20 km/h; 13 mph)
Test depth	230 ft (70 m)
Complement	67 (10 officers)
Armament	6 × bow torpedo tubes 2 × stern torpedo tubes 2 × external stern torpedo tubes (24 torpedoes) 2 × 100 mm (4 in) guns 2 × 45 mm (1.8 in) guns 20 × mines

The K class or Kreiserskaya-class (Russian: Крейсерская, lit. 'cruiser') were a class of cruiser submarines and were the largest submarines built for the Soviet Navy during World War II. Eleven boats of the class were made, one was cancelled and scrapped. The K class submarines served in the Northern Fleet and the Baltic Fleet, and saw the most combat along the coast of Norway. They were also nicknamed the Katyusha-class.^[1]