After the second war with India in 1965, the Indian Navy underwent a rapid modernization and expansion, causing the Pakistan Navy's focus to shift towards strengthening their existing Submarine Command (COMSUBS) due to unable to acquire fighter jets from the Air Force. In 1966, the Ayub administration began the development and acquisition of the from France. France renamed these submarines according to the Pakistan Navy's standards. "Hangor" was the lead ship of her class, which included and , all commissioned in 1970.