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Mike-class submarine : ウィキペディア英語版
Soviet submarine K-278 Komsomolets

K-278 ''Komsomolets'' was the only Project 685 ''Plavnik'' (Плавник, meaning "fin", also known by its NATO reporting name of "Mike"-class) nuclear-powered attack submarine of the Soviet Navy. On 4 August 1984 ''K-278 '' reached a record submergence depth of in the Norwegian Sea. The boat sank in 1989 and is currently resting on the floor of the Barents Sea, one mile deep, with its nuclear reactor and two nuclear warheads still on board. The single Project 685 was developed to test technologies for Soviet 4th generation nuclear submarines. Although primarily intended as a developmental model, it was fully combat capable, but sank after a fire broke out in the aft engineering compartment on its first operational patrol.
The ''Komsomolets'' was able to surface after the fire started and remained afloat for approximately 5 hours before sinking. Of the 42 crewmembers who died, only 4 were killed by the fire and smoke, while 34 died of hypothermia and drowning in the frigid waters while awaiting rescue that did not arrive in time. Because of this shocking loss of life a very public enquiry was conducted and, as a result, many formerly classified details were revealed by the Soviet news media.
==Design==

The Project 685 was designed by the Rubin Design Bureau in response to a challenge to develop an advanced submarine that could carry a mix of torpedoes and cruise missiles with conventional or nuclear warheads. The order to design the submarine was issued in 1966 and design was completed in 1974. The first (and only) keel was laid down on 22 April 1978 at Severodvinsk. ''K-278'' was launched on 3 June 1983 and commissioned on 28 December 1983.
''K-278'' had a double hull, the inner one being composed of titanium, which gave her an operating depth far greater than that of the best American submarines. The pressure hull was composed of seven compartments with the second and third protected by stronger forward and aft bulkheads creating a "safety zone" in case of an emergency. An escape capsule was fitted in the sail above these compartments to enable the crew to abandon ship in the event of an underwater emergency. Initial Western intelligence estimates of ''K-278''’s speed were based on the assumption that it was powered by a pair of liquid-metal lead-bismuth reactors. When the Soviet Union revealed that the submarine used a single OK-650b-3 conventional pressurized-water reactor, these speed estimates were lowered.〔The OK-650 reactor was also installed on Project 971 (Akula), Project 945 (Sierra), and in pairs on the Project 941 (Typhoon) submarines.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Soviet submarine K-278 Komsomolets」の詳細全文を読む



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