Pakistan telefilm releases a movie named hangoor a story based on the extraordinary naval battle during the 1971 Indo-Pak war. when Pakistani submarine Hangor sank the Indian Navy's warship Kukri along with its crew in Indian waters. Where it also paralyzed another naval warship Kirpan. This was the first time a conventional submarine destroyed a naval warship post-second world war. Which is written in the navy history books with golden words
About hangoor:
Hangoor is a submarine (Nickname: Shark) that served in the Pakistan Navy from 1969. This was the only recorded submarine kill after World War II until the Falklands War when the Royal Navy's nuclear submarines.
For more info and also External link:
https://en.wikipedia.org/wiki/PNS_Hangor_(S131)