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| PNS Ghazi | |
|---|---|
| Ship name | Ghazi |
| Ship class | Tench-class submarine (Ghadir-class conversion) |
| Ship builder | Portsmouth Naval Shipyard |
| Laid down | 1944 |
| Launched | 1944 |
| Commissioned | 1944 (as USS Diablo), 1963 (as Ghazi) |
| Decommissioned | 1971 (sunk) |
| Fate | Lost 1971 in Bay of Bengal |
| Displacement | 1,570 tons (surfaced) |
| Length | 95.8 m |
| Beam | 8.3 m |
| Propulsion | Diesel-electric |
| Speed | 20 knots (surfaced) |
| Complement | ~90 |
| Armament | Torpedoes, deck gun |
PNS Ghazi PNS Ghazi was a diesel-electric submarine acquired by the Pakistan Navy and previously served as the USN vessel USS Diablo. Built at Portsmouth Naval Shipyard and commissioned during World War II, she was later transferred under a military assistance program to Pakistan, where she became central to naval warfare operations in the Indian Ocean and played a pivotal role in the 1971 war. Her loss in 1971 off Visakhapatnam remains contested, involving narratives tied to the Indian Navy, Eastern Naval Command, and broader geopolitical dynamics of South Asia.
The submarine began as USS Diablo (SS-479), a Tench-class submarine constructed at Portsmouth Naval Shipyard during World War II alongside sister ships such as USS Torsk (SS-423), USS Ericcson (SS-440), and USS Archerfish (SS-311). The Tench-class lineage traced design evolution from the Gato-class submarine, Balao-class submarine, and wartime engineering advances by Electric Boat Company and Newport News Shipbuilding. Diablo featured diesel engines by General Motors and electric motors influenced by Westinghouse Electric, torpedo systems compatible with Mark 14 torpedo doctrines, and hull treatments derived from pressure-tested hulls studied by Bureau of Ships (BuShips). Postwar modernization trends informed later refits similar to programs at Submarine Refit Facility yards such as Chesapeake Bay and influenced transfer standards under Mutual Defense Assistance Act frameworks.
During US service, Diablo participated in postwar patrols, training missions with Atlantic Fleet units including operations near Bermuda, Norfolk, and cooperative exercises with Royal Navy escorts like HMS Onyx (P64). Decommissioned and placed in reserve at Philadelphia Naval Shipyard, she was offered under US foreign military sales and assistance to allies, culminating in transfer to the Pakistan Navy where she was recommissioned and renamed Ghazi. Under Pakistani command, the submarine conducted patrols in the Arabian Sea, training with surface units such as PNS Babur (D182), participated in anti-shipping exercises with the United States Seventh Fleet, and engaged in intelligence-gathering missions tied to regional tensions involving East Pakistan, West Pakistan, and neighbors including India and Soviet Union naval assets.
In the run-up to the 1971 conflict, Ghazi was deployed on a mission into the Bay of Bengal with orders reportedly to interdict shipping bound for Port Blair, to threaten INS Vikrant and other carriers of the Indian Navy, and to conduct reconnaissance near Visakhapatnam. The deployment intersected with strategic concerns involving Indian Navy carrier operations, the Eastern Naval Command’s coastal defenses, and Indian naval task forces centered on INS Vikrant (R11), INS Delhi (D61), and INS Brahmaputra (F31). Intelligence linkages referenced signals and communications monitored by Naval Signals Intelligence elements, and maritime patrols conducted by aircraft such as Breguet Atlantic and Lockheed P-3 Orion under Indian Air Force coordination.
Ghazi sank on the night of 3–4 December 1971 near the approaches to Visakhapatnam. The sinking spawned competing accounts: the Indian Navy attributed the loss to depth-charge attack and anti-submarine operations by INS Rajput (D141), INS Kuthar (K97), or coastal defenses coordinated from Visakhapatnam Command. Alternative Pakistani accounts propose accidental internal explosion, mine detonation, or structural failure, with hypotheses involving torpedo detonations, battery fires, or collision with unexploded ordnance. Investigations and inquiries by bodies including Naval Board elements, historian analyses by scholars associated with International Institute for Strategic Studies, and archival research at institutions such as National Archives of India and Pakistan Navy Museum produced disparate interpretations. Eyewitness reports from survivors of other Pakistani units, declassified signals examined by analysts at Centre for Strategic and International Studies and accounts by journalists in outlets like Dawn and The Hindu contributed to the contested narrative. Technical analyses referenced Tench-class vulnerabilities documented in US postwar reports and comparative cases like the loss of USS Thresher (SSN-593) and USS Scorpion (SSN-589) though differing propulsion and depth capabilities complicate direct analogy.
Ghazi's disappearance has had lasting effects on Pakistan Navy identity, memorialization at naval sites such as the PNS Ghazi Memorial in Karachi and commemorative ceremonies attended by veteran associations, families, and officials including figures from Ministry of Defence delegations. In India, the incident shaped narratives within the Indian Navy and influenced doctrine for anti-submarine warfare investments, procurement of platforms like INS Vikrant (R11) and sonar systems from firms such as Sperry Corporation and Thales Group, and training at institutions like the National Defence Academy (India). Scholarly treatments appear in works published by historians affiliated with Oxford University Press, Cambridge University Press, and regional studies from Observer Research Foundation, while cinematic and literary portrayals in South Asian media sparked public interest and debate involving publishers such as Penguin India and broadcasters like Doordarshan. Ghazi remains a subject of naval studies, archival research, and commemoration across South Asia.
Category:Submarines of the Pakistan Navy Category:Tench-class submarines Category:1971 in naval history