was considered quite difficult and dangerous, with the submarine squadron sailing under the assumption that the dangerous nature of this mission meant a great mortal risk to the submarine and her crew. Service with Pakistan Navy Western Front of Indo-Pakistani war of 1971 On the midnight of 26 November 1971, Hangor sailed from its base with a load of torpedoes to patrol the Bombay Harbour. Soon after deployment, defects were noted in the ship's computers but were soon repaired as the patrol continued. Initially, there were two contacts that were picked up by the computers and were identified as warships, ranging . The ship could not pursue its targets due to the warships' speed and the distance between them. Hangors crew did, however, manage to predict the warships' movements. At midnight of 2/3 December 1971, Hangor, remaining submerged in a northerly direction, investigated radio transmissions intercepted from the warships belonging to the Western Naval Command of the Indian Navy that would launch a first missile attack on Karachi. Hangor was passed over by the large Squadron of the Western fleet of the Indian Navy. The cruiser passed directly over the submarine. All transmissions and computers were shut down to avoid the detection by the Indian fleet, and once passed over Cmdr. Tasnim broke the radio silence and communicated with the Navy NHQ to warn of the attack, but this message was intercepted. On 3 December 1971, the Indian Navy dispatched two ASW frigates, and , under the command of Captain M. N. Mulla. On 4 December 1971, Navy NHQ communicated with Hangor, giving her war codes to attack the Indian Navy's armada. On 9/10 December 1971, at 19:00, Hangor detected the possible signature of the two Indian frigates dispatched in response to the intercepted communications. Later, around midnight, Cdr. Tasnim ordered Hangor to dive deep to carry out a blind (sonar only) approach as the torpedo team concentrated on tracking the two targets as they gradually came within firing range. At 19:57, the submarine fired a down-the-throat shot with a homing torpedo at Kirpan from a depth of . The torpedo was tracked, but no explosion was heard. It was then speculated that the torpedo had missed its target, and the moment Kirpan sensed the torpedo, the captain of Kirpan realized that the ship was under attack turned away at maximum speed from the scene. Hangor had struck first, but