Mr. Jeets: Sinking of PNS Ghazi is a very long stoy amd involved detailed planning by both Indian Eastern Naval Command and Pakistani Navy. It requires a long presentation. However, let me try to give snippets of information.
Planning for war started in Pakistan by May, 1971 (after Operation Searchlite). As an exception, Pakistany Navy always believed the superiority of Indian Navy. So, their plan was to create maximum attrition to Indian Navy. Paki Navy never fought to defeat Indian Navy, but to cause maximum damage.
India's only aircraft carrier INS Vikrant was transferred from Western Naval Command to Eastern Naval Command in Sept. 1971. Its task was to blockade Chittagong port and to establish absolute marine superiority in Bay of Bengal general area. It was being re-fitted at Vizag (HQ, Eastern Naval Command).
Paki Navy's ultimate aim was to destroy INS Vikrant . If not possible, then their plan was to confine INS Vikrant in Vizag harbour, so that it can't take part in the war. For this purose, Pakistan Navy sent its best available submarine, PNS Ghazi in the vicinity of Vizag during the first week of November, 1971 itself. Ghazi started mining the entrance channel of Vizag harbour since November.
Vice Admiral N. Krishnan, the fat, short but extremely shrewd Eastern Naval Commander, anticipated Paki move well in advance. Later his anticipation was corroborated by Paki signals intercepted by India. Vice-Admiral Krishnan also understood the presence of Paki spy at Vizag. He made a brilliant deception plan.
He chose the oldest Destroyer of Indian Navy, INS Rajput, and its captain, Lt. Cdr. Inder Singh to carry out the deception plan. INS Rajput, which was on the verge of retirement, was sent for elaborate re-fitting and painting. It came out of Vizag harbour on the night of 3rd December, 1971.
Pakistani spies stationed at Vizag fell for the deception plan lock, stock and barrell. Immediate information was sent to Karachi Naval Headquarter that INS Vikrant came out of Vizag harbour. From Karachi, immediate order went to PNS Ghazi hiding outside the Vizag to attack INS Vikrant. PNS Ghazi came out of the sea. INS Rajput identified its signature and released two depth charges. These two hit PNS Ghazi. At the same time, it fell on its own mines kept at the bottom of the sea. That was the end of PNS Ghazi, winner of two decorations of Sitara-e-Jurrat, one Tamgha-i-Jurrat, and the President's citations and six Imtiazi Sanads.
On 4th December, 1971, immediately after midnight, people of Vizag got out of their bed hearing a loud explosion. Pakistan Navy lost its most precious submarine even before the commencement of the war. PNS Ghazi commander Zafar Muhammad Khan most probably understood before his death that he had been fooled. The Indian ship was not INS Vikrant. It was the old Destroyer, INS Rajput, which was on the verge of retirement.
Caution: Explosive. Handle with care.