Anti-submarine warfare
On 2 and 3 December, "Hangor" had detected a large formation of ships from Indian Navy's Western fleet which included cruiser INS "Mysore". "Hangor" had passed an intelligence to Pakistan naval forces of a possible attack by the observed Indian Armada near Karachi. The Indian Naval Intelligence intercepted these transmissions, and dispatched two Anti-submarine warfare frigates, INS "Khukri" and the INS "Kirpan" of 14th Squadron – Western Naval Command.