Ahmad Tasnim Vice Admiral Ahmad Tasnim , HI ( M ) , SJ ( Bar ) , SBt , is a now - retired three - star naval officer who is most famous as the Commander of the PNS Hangor when it sunk the INS Khukri at 20 : 00 hrs on 8 December 1971 during the Indo - Pakistani War of 1971 , off the coast of Diu , Gujarat , India . ( This was the first submarine kill since World War II , and the only one until a Royal Navy nuclear submarine HMS " Conqueror " sank an Argentine cruiser " General Belgrano " during the Falklands War . ) He is also only officer in Pakistan Navy to have been awarded Sitara - e - Jurat ( SJ ) and Bar . Naval career . Ahmad was commissioned in Pakistan Navy as Midshipman in 1954 . He attended the United States Naval Academy , and had participated in the Vietnam War as a torpedo officer of the United States Navy ' s USS Triton ( SSRN - 586 ) in 1960s , but came back to Pakistan as a result of Indo - Pakistani War of 1965 . He is one of the Pakistani military officer who volunteered to participate in Vietnam War with the United States Navy . Before him , Air Chief Marshal ( General ) Abbas Khattak participated in the conflict with the United States Air Force . He was later sent to trained at the Daphné class submarine in France after the war . He was the senior officer at the PNS Hangor ( S131 ) ' crew and , as Lieutenant Commander , he activity participated in the war . After the war , he was conferred with Sitara - e - Basalat in 1965 . In 1969 , he was promoted to the rank Commander , and was made Commander Officer of the PNS Hangor ( S131 ) . In the night of November 22 , 1971 , PNS Hangor was deployed under the command of Commander Ahmad Tasnim . In the night of 2 and 3 December 1971 , the PNS Hangor , while lying in wait off Bombay , detected a large formation of ships from the Indian Navy Western fleet that included cruiser INS Mysore ( 1939 ) . Sensing impending war in the West - Pakistan , Indian Naval armada was sailing out of Bombay Harbour , and passed incredibly close to Hangor . Since the PNS Hangoor ' s Commander had not received any clearance to engaged in the battle , he did not engage the fleet . On December 3 , 1971 , the Indian Navy received electronic transmission from PNS Hangor to Karachi Naval Operations Base ( known as COMKAR ) . The Indian Navy dispatched two anti - submarine warfare frigate , INS Khukri ( 1958 ) and the " " INS Kirpan " " of 14 Squadron of the Western Naval Command . On 9 December 1971 , 19 : 00 hours , Commander Ahmad of PNS Hangor received confirmation of the INS Kurki and INS Kirpan ' s coordinates from then - Lieutenant Fasih Bokhari and then - Lieutenant A . U . Khan . Commander Tasnim first diverted the submarine ' s position and managed to forecast the target ships movement . He then succeeded in taking up a tactically advantageous position on the path of the patrolling frigates by 1900 hours . At 1957 hours , the submarine fired a down the throat shot with a homing torpedo at the northerly ship from a depth of 40 meters . Under the command of Commander Tasnim , PNS Hangor 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 . The first torpedo was tracked but no explosion was heard . The second torpedo was therefore fired immediately on the incoming southerly ship and this was followed by a tremendous explosion . The torpedo had found its mark . The other enemy frigate came straight for the submarine when a third torpedo was fired . A distant explosion was heard subsequently and the submarine turned west towards deeper waters for evasion . Post War career . Commander Ahmad Tasnim was made a national hero after his actions . In 1972 , he was conferred with Sitara - e - Jurat , Hilal - i - Imtiaz ( Military ) , and Sitara - e - Basalat ( for the second time ) . He is also the only naval officer in Pakistan Navy to have been awarded Sitara - e - Jurat ( SJ ) and Bar . ( " Bar " refers to a second award of the same honour ) . Following his promotion , he was elevated as Captain in the Navy . After the war , he was elevated to Commodore and became a commander of Pakistan ' s naval fleet . In 1984 , he was promoted to Rear Admiral and commanded the Pakistan Fleet ( COMPAK ) ; followed by another assignment as Commandant of Pakistan Naval War College . In 1990 , he became chairman of Karachi Shipyard . The same year , he was promoted to Vice Admiral , where he also had served as the Board of Governors of Cadet College Petaro where he stayed there until 1991 . In 1992 , he became chairman of Karachi Port Trust until 1994 . The same year , he took retirement from Pakistan Navy , and now currently resides in Islamabad .