Pakistan Navy has released a special promo on Hangor Day, paying tribute to martyrs and Ghazis and highlighting Pakistan Navy's Hangor Submarine's great success against the enemy.

On this day in 1971, Pakistan Navy's Hangor submarine targeted Indian Naval Ship Khukri, sinking it and crippling another Indian ship Kirpan.

It was the first incident after World War II that a submarine destroyed a naval warship.