INS Khukri was a Type 14 anti-submarine warfare frigate of the Indian Navy. She was sunk off the coast of Diu, Gujarat, India by the Pakistan Navy Daphne class submarine Hangor on 8 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 Indian navy's worst wartime loss.
After the beginning of hostilities on 3 December 1971, Indian Naval radio detection equipment identified a submarine lurking in the vicinity of Diu harbour about 35 miles south-west of the port of Diu.
The 14 Squadron of the Western Fleet, Khukri
along with sister ships, Kirpan
(all named after types of dagger), were dispatched on a hunter-killer mission to destroy the submarine. One reason that may have prompted the decision to deploy two obsolete Blackwood class frigates was that the Indian Navy lacked sufficient numbers of airborne anti-submarine
was the slowest warship in the squadron because she was testing an improved version of the 170/174 sonar, which required a slow speed to increase detection. This was to be her undoing.
The submarine sighted the Squadron on the evening of 8 December. It fired two homing torpedoes on a sonar approach, one of which missed Kirpan
at 19:57 hrs. The second torpedo directed at Khukri
struck under its magazine at 20:00, and the ship sank within two minutes, according to the Pakistani submarine captain, Commander (later Vice... Read More