Echo-class submarine

	Nuclear-powered cruise-missile submarine of Project 675 (Echo II)
Class overview
Builders	Komsomolsk-on-Amur, shipyard No. 199; Severodvinsk, shipyard No. 402;
Operators	Soviet Navy; Russian Navy;
Preceded by	Whiskey Long Bin class
Succeeded by	Juliett class; Charlie class;
In commission	19 November 1960–15 July 1994
Completed	Echo I : 5; Echo II : 29;
General characteristics
Type	Nuclear submarine
Displacement	Echo I :; 3,768 long tons (3,828 t) surfaced; 4,920 long tons (4,999 t) submerged; Echo II :; 4,415 long tons (4,486 t) surfaced; 5,760 long tons (5,852 t) submerged;
Length	Echo I : 111.2 m (364 ft 10 in); Echo II : 115.4 m (378 ft 7 in);
Beam	Echo I : 9.2 m (30 ft 2 in); Echo II : 9.3 m (30 ft 6 in);
Draught	Echo I : 7.1 m (23 ft 4 in); Echo II : 7.4 m (24 ft 3 in);
Propulsion	Echo I : 2 pressurized water-cooled reactors 44,500 hp (33 MW) each, 2 steam turbines, 2 shafts; Echo II : 2 pressurized water-cooled reactors 70,000 hp (52 MW) each, 2 steam turbines, 2 shafts;
Speed	Echo I :; 15.1 knots (17.4 mph; 28.0 km/h) surfaced; 24.2 knots (27.8 mph; 44.8 km/h) submerged; Echo II :; 14 knots (16 mph; 26 km/h) surfaced; 22 knots (25 mph; 41 km/h) submerged;
Range	18,000–30,000 miles (29,000–48,000 km)
Endurance	50 days
Test depth	300 m (984 ft)
Complement	104-109 men (including 29 officers)
Armament	Echo I :; 6 × P-5 Pyatyorka cruise missiles; 4 × 533 mm (21 in) bow torpedo tubes; 2 × 400 mm (16 in) bow torpedo tubes; 2 × 400 mm (16 in) stern torpedo tubes; Echo II :; 8 × P-6 cruise missiles; 4 × 533 mm (21 in) bow torpedo tubes; 2 × 400 mm (16 in) stern torpedo tubes; Echo II mod :; P-6 replaced with 8 × P-500 or P-1000 (SS-N-12 "Sandbox") missiles;

The Echo class were nuclear cruise missile submarines of the Soviet Navy built during the 1960s. Their Soviet designation was Project 659 for the first five vessels, and Project 675 for the following twenty-nine. Their NATO reporting names were Echo I and Echo II. All were decommissioned by 1994.

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