INS Khukri (F149) Memorial at DIU which was destroyed by Pakistan in 1961 INDOPAK war

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INS Khukri was a Type 14 (Blackwood-class) frigate of the Indian Navy. She was sunk off the coast of Diu, Gujarat, India by the Pakistan Navy Daphné-class submarine Hangor 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.
Sinking
After the beginning of hostilities on 3 December 1971, Indian Naval radio detection equipment identified a submarine lurking about 35 miles (56 km) south-west of Diu harbour. The 14th Frigate Squadron of the Western Fleet was dispatched to destroy the submarine.It normally consisted of five ships, Khukri, Kirpan, Kalveti, Krishna and Kuthar, 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.
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 low speed to increase detection, despite the fact that moving on low speed was against Indian anti-submarine doctrine.At 19:57 Hangor fired a homing torpedo on a sonar approach at Kirpan. The torpedo did not 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.Other sources claim that Khukri was struck by three torpedoes before going down.
After a few minutes, Kirpan attacked Hangor with depth charges, as her anti-submarine mortars were no longer functional.Hangor then fired a final torpedo at Kirpan before leaving the area.Hangor patrolled the region for the next four days before returning safely to her berth.
Source : Wikipedia

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