PNS/M Hangor (S-131) (nicknamed: "Shark") was a diesel-electric submarine that served in the Pakistan Navy from 1969 until its decommissioning in 2006. It is the first submarine to sink ship after World War II. Hangor (S131) was the lead ship of her class, designed and constructed by France after a long and complicated negotiation which started in 1966. In 1969, Hangor was commissioned in the Submarine Command (SUBCOM) when she reported back to her home base in Karachi from Paris. Hangor, under the command of Commander Ahmed Tasnim, sank the Indian Navy's , an anti-submarine frigate, with one homing torpedo on 9 December 1971 during the western front of the third war with India in 1971. This was the only recorded submarine kill after World War II until the Falklands War, when the Royal Navy's nuclear submarine sank the Argentine Navy cruiser . The strategic impact was even more significant as the Indian navy cancelled "Operation Triumph", the third missile attack, which was to be launched on 10 December. Acquisition and initial deployment After the second war with Pakistan in 1965, the Indian Navy underwent a rapid modernization and expansion, causing the Pakistan Navy's focus to shift towards strengthening their existing Submarine Command (COMSUBS) due to being unable to acquire fighter jets from the Air Force. In 1966, the Ayub administration began the development and acquisition of the from France. France renamed these submarines according to the Pakistan Navy's standards. Hangor was the lead ship of her class, which included and , all commissioned in 1970. Training of the crew took place in 1968. Notably, Hangors officers that served in 1971 included: Commander Ahmed Tasnim, the commanding officer. Lieutenant-Commander A. U. Khan, second-in-command and the navigation officer Lieutenant-Commander R. A. Kadri, the electrical officer. Lieutenant Fasih Bokhari, the navigation officer. The ship's first war-time deployment was in August 1971, gathering intelligence on the Indian Navy and clearing the Manora Island and Ormara Bay in the coastal areas of Pakistan. Hangor reported back to base in September 1971 but was again deployed in November 1971. As Indian covert involvement in the East Pakistan grew, the Navy NHQ in Karachi deployed its only (albeit aging) long-range submarine, , under the command of Z.M. Khan, to pick up intelligence and track the aircraft carrier off the Bay of Bengal in November 1971. According to Rear-Admiral R. A. Kadri in 1999, the assigned mission