INS Nirghat (K89)
INS "Nirghat" (K89) was a of the Indian Navy. "INS Nirghat" was a part of the 25th "Killer" Missile Squadron of the Indian Navy. Operation Trident. During the Indo-Pakistani War of 1971, INS "Nirghat" was part of the Operation Trident strike force, along with her sister vessels from the 25th Killer Squadron ( and ). On the afternoon of 4 December 1971, the strike group made its way towards Karachi. Late that evening, around 70 miles south of Karachi, "Nirghat" detected a large Pakistan Navy target, later identified as the destroyer PNS "Khaibar", about 45 miles to her  northwest. "Nirghat" launched two SS-N-2 Styx missiles at "Khaibar", sinking her. Other vessels of the strike group sank the Pakistan Navy minesweeper PNS "Muhafiz" and the merchant ship "MV Venus Challenger". Lieutenant Commander Inderjit Sharma, the commanding officer, and Master Chief Petty Officer M. N. Sangal of "Nirghat" were awarded the Vir Chakra for their roles during the operation.