# 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.

## In service

| Class | Type | Boats | Origin | Displacement | Note |
| Nuclear-powered submarines (2) ||||||
| Arihant class | Ballistic missile submarine (SSBN) | INS Arihant (S2) INS Arighaat (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) | 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. |
| 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. |

## Under construction

| Class | Type | Boats | Origin | Displacement | Status |
| Nuclear submarines (2) |||||||
| Arihant class | Ballistic missile submarine (SSBN) | INS Aridhaman S4* (code name) | India | 7,000 tonnes | Both launched and to be commissioned by 2025. |
| Diesel-electric submarines (3) |||||||
| 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. |

## Planned

| 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). |
| 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. Project clearance was granted by the Cabinet Committee on Security in February 2015. |
| Akula class | Attack submarine (SSN) | 1 | 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. |
| Diesel-electric submarines (21) ||||||||
| 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 and Spanish S-80 plus class submarine. |
| 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. |
| Project 76 class | Attack submarine | 12 | India | Unspecified | 12 planned | To be designed, developed and built in India |

## Decommissioned

| Class | Ships | Origin | Commissioned | Decommissioned | Displacement | 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. |