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INS ''Khukri'' was a British Type 14 (''Blackwood''-class) frigate of the Indian Navy. She was sunk off the coast of Diu, Gujarat, India by the Pakistan Navy submarine on 9 December 1971 during the Indo-Pakistani War of 1971. This was the first warship sunk in action by a submarine since World War II. It remains the post-Independence Indian navy's only warship to be lost in war to date.〔〔 ==Incident== After the beginning of hostilities on 3 December 1971, Indian Naval radio detection equipment identified a submarine lurking about south-west of Diu harbour. The 14th Frigate Squadron of the Western Fleet was dispatched to destroy the submarine.〔 It normally consisted of three ships ''Khukri'', and , but at the time of the incident ''Kuthar''s boiler room was being repaired in Bombay.〔 One reason that may have prompted the decision to deploy two obsolete ''Blackwood''-class frigates against a modern ''Daphne''-class submarine was that the Indian Navy lacked sufficient numbers of anti-submarine aircraft.〔(Indian-Subcontinent Database ) 〕 In the early hours of 9 December, ''Hangor'' picked up two sonar contacts in the area.〔 The sonar and radar transmissions identified them as warships but ''Hangor'' failed to intercept them and lost contact when the range increased.〔 The submarine sighted the squadron on the evening of 9 December. ''Khukri'' was still not aware of the submarine's presence〔 〕 and continued slowly on a steady course because she was testing an improved version of the 170/174 sonar, which required a slow speed to increase detection, despite the fact that moving on slow speed was against Indian anti-submarine doctrine. At 19:57 ''Hangor'' fired a homing torpedo on a sonar approach at ''Kirpan''.〔 The torpedo failed to explode〔〔 and was detected by ''Kirpan'' which turned away and fired anti-submarine mortars.〔 ''Khukri'' increased its speed and turned towards the submarine, which then fired a second torpedo directed at ''Khukri''.〔 The torpedo struck ''Khukri'' and exploded under its oil tanks.〔〔 According to the Pakistani submarine captain, Commander Ahmed Tasnim, the ship sank within two minutes.〔(Interview with Vice Admiral Tasneem, December 2008 ) 〕 Other sources claim that ''Khukri'' was struck by three torpedoes before going down.〔Friedman, Norman (1984). ''Submarine design and development''. Conway Maritime, p. 188〕 After a few minutes, ''Kirpan'' turned back to attack ''Hangor'' with depth charges, as her anti-submarine mortars had broken down.〔 ''Hangor'' then fired another torpedo at ''Kirpan'' before turning away and exiting at maximum speed.〔〔 ''Kirpan'' outran the torpedo and quickly disengaged returning later with another ship, ''Katchal'', to search for the survivors from ''Khukri''.〔 ''Hangor'' patrolled the region for the next four days before returning safely to her berth. 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「INS Khukri (F149)」の詳細全文を読む スポンサード リンク
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