Class overview
Name:	Akula (Акула) (NATO: Typhoon)
Builders:	Sevmash, designed by Rubin
Operators:	Soviet Navy Russian Navy
Preceded by:	Delta class
Succeeded by:	Borei class
Built:	1976–1986
In service:	1981–present
In commission:	1981–1989
Planned:	7
Completed:	6
Cancelled:	1
Active:	1
Laid up:	2
Retired:	3
General characteristics
Type:	Ballistic missile submarine
Displacement:	23,200–24,500 t (22,830–24,110 long tons) surfaced 33,800–48,000 t (33,270–47,240 long tons) submerged
Length:	175 m (574 ft 2 in)
Beam:	23 m (75 ft 6 in)
Draught:	12 m (39 ft 4 in)
Propulsion:	2 × OK-650 pressurized-water nuclear reactors, 190 MWt each 2 × VV-type steam turbines, 37 MW (49,600 hp) each 2 shafts with 7-bladed shrouded screws
Speed:	22.22 knots (41.15 km/h; 25.57 mph) surfaced 27 knots (50 km/h; 31 mph) submerged
Endurance:	120+ days submerged[1]
Test depth:	400 m (1,300 ft)
Complement:	160 persons[1]
Armament:	1 × 9K38 Igla SAM 6 × 533 mm (21 in) torpedo tubes RPK-2 Viyuga cruise missiles Type 53 torpedoes[2] D-19 launch system 20 × RSM-52 SLBMs

The Project 941 or Akula (Russian: Акула, lit. 'Shark') class submarine (NATO reporting name: Typhoon) is a type of nuclear-powered ballistic missile submarine deployed by the Soviet Navy in the 1980s. With a submerged displacement of 48,000 tonnes,^[1] the Typhoons are the largest submarines ever built,^[3] able to accommodate comfortable living facilities for the crew when submerged for months on end.^[4] The source of the NATO reporting name remains unclear, although it is often claimed to be related to the use of the word "typhoon" ("тайфун") by General Secretary Leonid Brezhnev of the Communist Party in a 1974 speech while describing a new type of nuclear ballistic missile submarine, as a reaction to the United States Navy's new Ohio-class submarine.^[5]

The Russian Navy cancelled its Typhoon modernisation program in March 2012, stating that modernising one Typhoon would be as expensive as building two new Borei-class submarines.^[6] With the announcement that Russia has eliminated the last SS-N-20 Sturgeon SLBMs in September 2012, the remaining Typhoons have reached the end of service.^[7]

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