List of submarines of the Indian Navy

This is a list of known submarines of the Indian Navy, grouped by class, and pennant numbers within the class.^[1]

In service

Class	Type	Boats	Origin	Displacement	Note
Nuclear-powered submarines (2)
Arihant class	Ballistic missile submarine (SSBN)	INS Arihant (S2) INS Arighat (S3)	India	6,000 tonnes	Powered by a 83 MW pressurized light-water reactor using enriched uranium. First prototype of the ATV project and experimental protoype.
Diesel-electric submarines (17)
Kalvari class (Scorpène-class)	Attack submarine	INS Kalvari (S21) INS Khanderi (S22) INS Karanj (S23) INS Vela (S24) INS Vagir (S25) INS Vaghsheer (S26)^[2]	France India	1,775 tonnes	French design. India got full technology transfer and license for up to 12 units produced locally in Indian shipyards.
Shishumar class (Type 209 submarine)	Attack submarine	INS Shishumar (S44) INS Shankush (S45) INS Shalki (S46) INS Shankul (S47)	West Germany India	1,850 tonnes	Shishumar and Shankush scheduled for mid-life refit in 2020-21.^[3]
Sindhughosh class (Kilo-class)	Attack submarine	INS Sindhughosh (S55) INS Sindhuraj (S57) INS Sindhuratna (S59) INS Sindhukesari (S60) INS Sindhukirti (S61) INS Sindhuvijay (S62) INS Sindhurashtra (S65)	Soviet Union Russia	3,076 tonnes	Sindhuraj and Sindhukesari currently undergoing mid-life refit. Sindhughosh scheduled for refit in 2020.^[3]

Class	Type	Boats	Origin	Displacement	Status
Nuclear submarines (2)
Arihant class	Ballistic missile submarine (SSBN)	S4 (code name) S4* (code name)	India	7,000 tonnes (S4 and S4*)	S4 launched and undergoing fit-out S4* hull under construction^[4]^[5]
Diesel-electric submarines (1)
Kalvari class	Attack submarine	INS Vagsheer (S26)	France India	above 2000 tonnes	Three more units ordered with a new plug module that would give the submarine AIP capability. These units will be larger in size and it is planned that all previous units will be upgraded during their next overhaul cycle.^[6]

Class	Type	Boats	Origin	Displacement	Status	Note
Nuclear submarines (10)
S5 class	Ballistic missile submarine (SSBN)	3	India	13,500 tonnes	3 planned	Project was approved with a budget of ₹10,000 crore (US$1.2 billion).^[7]^[8]^[9]
Project 75 Alpha	Attack submarine (SSN)	6	India	6,000 tonnes	6 planned	6 boats are planned and are expected to be constructed at the Shipbuilding Centre (SBC) at Visakhapatnam.^[10] Project clearance was granted by the Cabinet Committee on Security in February 2015.^[11]
Akula class	Attack submarine (SSN)	0	Russia	12,770 tonnes	1 planned	In March 2019, India signed a US$3 billion agreement with Russia to lease another Akula-class submarine, which is expected to join the Indian Navy by 2025.^[12]
Diesel-electric submarines (9)
Project 75I-class submarine	Attack submarine (SSK); possibly cruise missile submarine (SSG)	6	India	Unspecified	6 planned	It had been approved by the government worth ₹43,000 crore in June 2020. As of 2024, contestants include German Type 214 class submarine^[13] and Spanish S-80 plus class submarine.^[14]
Kalvari class	Attack submarine	3	India/ France	Above 2000 tonne	3 planned	New plug module that would give the submarine AIP capability. These units will be larger in size and it is planned that all previous units will be upgraded during their next overhaul cycle.^[6]
Project 76 class	Attack submarine	12	India	Unspecified	12 planned	To be designed, developed and built in India^[15]^[16]

Decommissioned

Class	Ships	Origin	Commissioned	Decommissioned	Displacement^[a]	Note
Nuclear-powered attack submarines (2)
Charlie I-class	INS Chakra (K-43)	Soviet Union	1 September 1987	January 1991	5,000 tonnes	Leased for 10 years but returned to Soviet Union in 1991 after 3 years. Decommissioned and scrapped 1992.
Improved Akula I-class	INS Chakra (S71)	Russia	4 April 2012	June 2021	8,140 tonnes	Under a 10-year lease from Russia since 2012; returned 2021.
Diesel-electric submarines (10)
Kalvari class (Foxtrot-class)	INS Kalvari (S23) INS Khanderi (S22) INS Karanj (S21) INS Kursura (S20)	Soviet Union	8 December 1967 6 December 1968 4 September 1969 18 December 1969	31 May 1996 18 October 1989 1 August 2003 27 September 2001	2,475 tonnes	-Sail on display -Sail on display -Unknown -As a museum
Vela class (Foxtrot-class)	INS Vela (S40) INS Vagir (S41) INS Vagli (S42) INS Vagsheer (S43)	Soviet Union	31 August 1973 3 November 1973 10 August 1974 26 December 1974	25 June 2010 7 June 2001 9 December 2010 30 April 1997	2,475 tonnes	-Unknown -Unknown -To be preserved as a museum -Unknown
Sindhughosh class (Kilo-class)	INS Sindhurakshak (S63) INS Sindhuvir (S58) INS Sindhudhvaj (S56)	Russia Soviet Union	24 December 1997 26 August 1988	6 March 2017 March 2020 16 July 2022	3,076 tonnes	-Decommissioned /sunk after accident/salvage -Transferred to Myanmar Navy.