 During the Indo-Pakistani War of 1971, The minesweeper PNS "Muhafiz" was tasked to patrol the approaches to port of Karachi.To do so it was deployed on the inner cordon.Late that evening on 4 December 1971, around 70 miles south of Karachi, the detected a large Pakistan Navy target, later identified as the "Muhafiz" on patrol to its north.