This volume of the history of the Indian navy covers the period from 1965 to 1975. Several major developments occurred during this decade. The latest design of the Royal Navy's Leander class frigates started being produced in Mazagon Docks in India with British collaboration. The first submarine arrived in 1968, and by 1975, the Submarine Arm had grown to eight submarines. The Air Arm was augmented by additional Seahawks, Alizes, and the latest British SeaKing antisubmarine helicopters equipped with dunking sonar. Along with the induction of modern fire-control systems in ships, submarines, and aircraft, the navy acquired its first guided missiles and homing torpedoes.