Soviet submarine K-162 was the only vessel of the Soviet Union's Project 661 Anchar nuclear-powered attack submarine design, best known in the West by its NATO reporting name Papa class. K-162, which was renamed K-222 in 1978.
The Papa class was designed as an extremely fast attack submarine equipped with first anti-ship cruise missiles with underwater launch SS-N-7 Starbright (П-70 «Аметист»). Its design included ten SS-N-7 missiles in individual tubes forward of the sail, between the inner and outer hulls which were of titanium alloy. It is regarded as a predecessor to the Alfa class submarine, and the single submarine of the Papa class may have tested technologies which were later used in the Alfa class. Papa-class boat was first submarine with titanium hull.
K-222 was laid down on December 28, 1963, and commissioned on December 31, 1969, at Severodvinsk. She was assigned to the Soviet Red Banner Northern Fleet for the duration of her career. She was the world's fastest submarine, reaching a record speed of 44.7 knots (82.8 km/h) on trials. Unofficial maximum speed, reached 30 March 1971 is 44,85 knots . However, that speed came at the price of high costs during construction, and both excessive noise and significant damage to external hull features when used.
On September 30, 1980, one of the nuclear reactors of the K-222 was damaged during maintenance in the shipyard. By 1988 the submarine was placed in reserve storage, moored at the Belomorsk Naval Base in Severodvinsk. The boat will be dismantled at Sevmash, the only facility capable of handling the titanium hull. Dismantling of this unique sub started on 5 March 2010 
The sole Papa class submarine appears in the Tom Clancy novel Red Storm Rising where she engages in a cat and mouse chase with the USN frigate Reuben James and the British frigate HMS Battleaxe before ultimately being sunk.
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