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Soviet submarine K-222
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===Armament, sensors and fire control=== [[File:DN-ST-84-01579-Papa class submarine 1983.JPEG|thumb|upright=1|A close-up of ''K-222''{{'}}s sail, 26 October 1983]] The submarine's primary armament consisted of 10 P-70 missiles in individual tubes between the inner and outer hulls forward of the [[Sail (submarine)|sail]]. The tubes were positioned upwards at an angle of 32.5 degrees. As the missile used four [[solid-propellant rocket|solid-propellant]] boosters, it could be launched underwater at a maximum depth of {{cvt|30|m|ft}}. No more than five missiles could be fired in one [[Volley fire|volley]] and the second volley could be fired three minutes later. The narrowness of the bow compartment prevented ''K-222'' from being fitted with more than four {{cvt|533|mm|in|0}} torpedo tubes, although she stowed eight reloads for them.<ref>Vilches Alarcón, pp. 46, 49</ref> The torpedoes could be fired down to a depth of {{cvt|200|m}}.<ref name=p0/> The massive cylindrical Rubin MGK-300 sonar system occupied the nose of the lower inner hull and measured {{cvt|6|m|ftin}} in diameter and {{cvt|3|m|ftin}} in height. It was fitted with both active and passive [[transducer]]s and was intended to detect [[carrier battle group]]s at long ranges. It would transmit the data to the missiles for its initial targeting. Locating targets accurately was initially limited to about {{convert|50|km|mi nmi}} with the missiles requiring a mid-course update if attacking targets further away. Later upgrades to the sonar allowed it to extend its range to the full {{cvt|70|km|mi nmi}} limit of the P-70 missiles. Once fired, the submarine did not have to provide any further targeting data as the missile was equipped with a radar of its own. ''K-222'' was also fitted with an Albatros RLK-101 search [[radar]] (NATO reporting name: Snoop Tray) and a Molniya<ref>Hampshire, pp. 15, 30</ref> (NATO reporting name: Pert Spring) [[communication satellite|satellite-communications system]].<ref>Polmar & Noot, p. 302</ref>
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