which is the first nuclear submarine to be designed and built in india
Arihant-class submarine The Arihant-class submarines are nuclear powered ballistic missile submarines built under the Advanced Technology Vessel (ATV) project.[21][22][23][24][25][26] They will be the first nuclear submarines designed and built by India.[27] The submarines are 112 m (367 ft) long with a beam of 11 m (36 ft), a draught of 10 m (33 ft), displacement of 6,000 tonnes (5,900 long tons; 6,600 short tons) and a diving depth of 300 m (980 ft). The complement is about 95, including officers and sailors.[28] The boats are powered by a single seven blade propeller powered by an 83 MW (111,000 hp) pressurised water reactor and can achieve a maximum speed of 12–15 knots (22–28 km/h) when surfaced and 24 knots (44 km/h) when submerged.[28]
Pokhran-II After Indira Gandhi became Prime Minister in 1966, the nuclear program was consolidated when physicist Raja Ramanna joined the efforts. Another nuclear test by China eventually led to India's decision toward building nuclear weapons in 1967 and conducted its first nuclear test, Smiling Buddha, in 1974.[6]