PNS/M Ghazi (S–130), originally the USS Diablo (SS-479), is a Tench-class diesel-electric submarine that holds the distinction of being Pakistan Navy’s first fast-attack submarine. Built during World War II, Diablo was launched on December 1, 1944, and commissioned into the United States Navy on March 31, 1945. She measures approximately 311 feet (94.8 meters) in length, with a beam of around 27 feet (8.2 meters), and a draft of roughly 15 feet (4.6 meters). Diablo had a displacement of about 1,475 tons submerged and was powered by diesel-electric propulsion, enabling her to reach speeds of up to 21 knots when surfaced and approximately 9 knots submerged. Diablo’s service history with the US Navy was extensive, including her initial war patrols during the closing days of World War II and subsequent operations in the Caribbean, the Atlantic, and along the US East Coast. Throughout her career, she participated in fleet exercises, antisubmarine warfare training, and weapons testing, and underwent several overhauls and refits, notably in 1960 when her hull classification was changed to AGSS-479. She was equipped with 14 Mark-14 torpedoes and, after her 1968 refit at Gölcük, Turkey, she was upgraded with modernized systems and capable of mine-laying. In 1964, Diablo was leased to Pakistan under a four-year Security Assistance Program, becoming PNS Ghazi. She was extensively refitted and modernized, but with limited upgrades, remaining largely unmodernized from her WWII origins. Ghazi played a significant role in Pakistan’s naval strategy, notably participating in the 1965 Indo-Pakistani war and serving as the flagship submarine. During this conflict, she engaged Indian naval targets and fired torpedoes, though no ships were confirmed sunk. Her most notable and controversial mission occurred during the 1971 Indo-Pakistani war, when Ghazi sailed toward the Bay of Bengal to locate and potentially attack Indian aircraft carrier INS Vikrant. On December 4, 1971, she sank off the Visakhapatnam coast under circumstances that remain uncertain, with theories ranging from internal explosion to accidental detonation of mines. Indian Navy claims her sinking was caused by depth charge attack, but Pakistan disputes this, suggesting possible mine detonation or other accidents. Her loss marked a significant event in regional naval history and remains shrouded in mystery, with debates over the exact cause continuing to this day. Overall, PNS Ghazi exemplifies a Cold War-era submarine with a storied operational history, symbolizing Pakistan's naval ambitions and strategic challenges during her service life.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.