Under the command of Admiral Sardarilal Mathradas Nanda, the navy successfully enforced a naval blockade of West and East Pakistan.[46] Pakistan's lone long-range submarine PNS Ghazi was sunk following an attack by the destroyer INS Rajput off the coast of Visakhapatnam in the midnight of 3–4 December 1971.[47][48] On 4 December, the Indian Navy successfully executed Operation Trident, a devastating attack on the Pakistan Naval Headquarters of Karachi that sank a minesweeper, a destroyer and an ammunition supply ship.