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The diesel-powered Pakistani submarine, PNS Ghazi, started life in the USA as USS Diablo, serving the US Navy between 1945 and 1964. It was decommissioned and downgraded in 1964. It was then loaned to Pakistan to beef up their defence as they were planning to start another conflict with their neighbour in 1965. In other words, it was a watered-down unmodernised submarine, having lost much of its killing prowess when Pakistan acquired it.
