The Yankee class, Soviet designations Project 667A Navaga (navaga) and Project 667AU Nalim (burbot) for the basic Yankee-I, were a family of nuclear-powered ballistic missile submarines built in the Soviet Union for the Soviet Navy. In total, 34 units were built: 24 in Severodvinsk for the Northern Fleet and the remaining 10 in Komsomolsk-on-Amur for the Pacific Fleet. Two Northern Fleet units were later transferred to the Pacific.

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Quick Facts Class overview, General characteristics ...

Yankee class SSBN profile
A Yankee I submarine underway.
Class overview
Name	Yankee class
Builders	Severodvinsk and Komsomolsk
Operators	Soviet Navy
Preceded by	Hotel class
Succeeded by	Delta class
Built	1964–1974
In commission	1967–1995
Completed	34
Lost	1
Retired	33
General characteristics
Type	Ballistic missile submarine
Displacement	7,700 tons Surfaced 9,300 tons submerged
Length	132 m (433 ft)
Beam	11.6 m (38 ft)
Draught	8 m (26 ft)
Propulsion	two pressurized water cooled reactors powering four steam turbines driving two shafts.
Speed	Surfaced: 13 knots (24 km/h; 15 mph) Submerged: 27 knots (50 km/h; 31 mph)
Range	unlimited
Complement	120
Armament	Yankee I/II:4 × 533 mm (21.0 in) torpedo tubes 2 × 400 mm (16 in) torpedo tubes Yankee I: 16 × R-27 (SS-N-6 Serb) SLBMs Yankee II: 12 × R-31 (SS-N-17 Snipe) SLBMs.

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The Yankee-class were subject to a wide variety of modifications; these ships have a different designation to the original model.

The Yankee-class nuclear submarines were the first class of Soviet ballistic missile submarines (SSBN) to have thermonuclear firepower comparable with that of their American and British Polaris submarine counterparts. The Yankee class were quieter in the ocean than were their Hotel-class predecessors, and had better streamlining that improved their underwater performance. The Yankee class were actually quite similar to the Polaris submarines of the U.S. Navy and the Royal Navy. These boats were all armed with 16 submarine-launched ballistic missiles (SLBM) with multiple nuclear warheads as nuclear deterrents during the Cold War, and their ballistic missiles had ranges from 1,500–2,500 nautical miles (2,800–4,600 km; 1,700–2,900 mi).

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• Length: 128 m (420 ft)
• Beam: 11.7 m (38 ft)
• Draught: 9 m (30 ft)
• Surface displacement: 7,760 tonnes
• Full (Diving) displacement: 11,500 tonnes
• Speed: 28 knots (52 km/h; 32 mph)
• Power plant: 2 VM-4 reactors
• Hull: Low magnetic steel
• Crew: 114
• Compartments: 10
• Armament:
  • 4 21 in (533 mm) torpedo tubes for 14 Type 53 torpedoes or mines.
  • 2 16 in (406 mm) torpedo tubes for 4 Type 40 torpedoes
  • 16 SS-N-6 liquid-fueled ballistic missiles

The Yankee-class SSBNs served in the Soviet Navy in three oceans: the Atlantic Ocean, the Pacific Ocean, and the Arctic Ocean beginning in the 1960s. During the 1970s about three Yankee-class were continually on patrol in a so-called "patrol box" in the Atlantic Ocean just east of Bermuda^[1] and off the US Pacific coast. This forward deployment of the SSBNs was seen to balance the presence of American, British, and French nuclear weapons kept in Western Europe and on warships (including nuclear submarines) in the surrounding Atlantic Ocean, including the Mediterranean Sea and the Eastern Atlantic.

The lead boat K-137 Leninets received its honorific name on 11 April 1970, two and one half years after being commissioned.

One Yankee-class submarine, K-219, was lost on 6 October 1986 after an explosion and fire on board. This boat had been at sea near Bermuda, and she sank from loss of buoyancy because of flooding. Four of her sailors died before rescue ships arrived. The events surrounding the loss of this boat has continued to be controversial.

At least one other boat in this class was involved in a collision with a U.S. Navy nuclear submarine.^{[citation needed]}

Because of their increasing age, and as negotiated in the SALT I, START I and START II treaties that reduce nuclear armaments of the United States and the Soviet Union, all boats of Yankee class were disarmed, decommissioned and sent to the nuclear ship scrapyards.