Project 75I-class submarine

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Class overview
Name: Project 75I
Operators:  Indian Navy
Preceded by: Kalvari class
Planned: 6
General characteristics
Type: Attack submarine
Propulsion: Diesel-electric and AIP

The Project 75I-class submarine is a follow-on of the Project 75 Kalvari-class submarines for the Indian Navy. Under this project, the Indian Navy intends to acquire six diesel-electric submarines, which will also feature advanced air-independent propulsion systems to enable them to stay submerged for longer duration and substantially increase their operational range.[1][2] All six submarines are expected to be constructed in Indian shipyards.[2]


In 1997, Indian Ministry of Defence approved a plan to acquire 24 submarines under Project 75.[3] After the Kargil War in 1999, Cabinet Committee on Security approved a 30-year submarine building plan that called for two parallel production lines, each constructing six submarines. The older Project 75 was brought under the new plan, with the two production lines to be built under Project 75 and Project 75I using transfer of technology from different foreign manufacturers.[4]

In 2008, it was reported that a Request for Information (RFI) had been issued to Armaris, HDW and Rosoboronexport for six submarines with air-independent propulsion and land-attack capability that were to be built in India.[5][6] In July 2010, Defence Acquisition Council of Ministry of Defence decided to import two submarines, build three at Mazagon Dock and one at Hindustan Shipyard with a budget of 50,000 crore (equivalent to 840 billion or US$12 billion in 2018).[7] After the project was approved by Defence Acquisition Council in August 2010, an RFI was issued again in September 2010.[8][9] However, the Request for Proposal was not approved by Cabinet Committee on Security due to a difference of opinion between the navy and ministry on the involvement of private shipyards in the project. As a result, the approval lapsed and was renewed multiple times till 2013.[10][11]

In October 2014, the Defence Acquisition Council decided to construct all six submarines in India and approved a budget of 53,000 crore (equivalent to 630 billion or US$9.2 billion in 2018).[1] Along with the state-owned Mazagon Dock, Hindustan Shipyard, and Cochin Shipyard, privately-owned Larsen & Toubro and Pipavav Shipyard were allowed to bid for the project in collaboration with a foreign shipyard.[12] Kockums, Naval Group, Rosoboronexport and ThyssenKrupp responded to an RFI issued in 2017.[13][14] In June 2017, it was reported that the contract for construction would be awarded under "Strategic Partnership" policy, which would eliminate state-owned shipyards from contention.[15] After the approval lapsed in February 2018, the Defence Acquisition Council renewed the approval with a budget of 40,000 crore (US$5.8 billion) in January 2019.[16][17] In April 2019, an Expression of Interest was issued for six submarines capable of firing land-attack and anti-ship cruise missiles.[18]

See also[edit]

External links[edit]

  • Project 75(I),


  1. ^ a b Sen, Sudhi Ranjan (26 October 2014). "6 Made-in-India Submarines for Navy for 53,000 Crores". NDTV.
  2. ^ a b Siddiqui, Huma (9 March 2015). "Narendra Modi government shortlists Larsen & Toubro, Pipavav for Rs 60,000 crore submarine contract". The Financial Express.
  3. ^ Saw, David (2005). "The World Submarine Situation". Armada International. Vol. 29 no. 6. Gurgaon: Media Transasia India Ltd. pp. 52–58. ISSN 0252-9793.
  4. ^ Singh, Sushant (13 November 2015). "Explained: India's submarine story in deep waters, long way to go". The Indian Express. Archived from the original on 15 February 2018.
  5. ^ Thapar, Vishal (17 February 2008). "Indian Navy eyes new submarines". CNN-IBN. Archived from the original on 12 January 2012.
  6. ^ Pandit, Rajat (20 October 2008). "Navy hunts for hi-tech submarines". The Times of India.
  7. ^ Pandit, Rajat (11 July 2010). "Biggest military deal: Six subs for Rs 50,000 crore". The Times of India.
  8. ^ N. C. Bipendra (7 September 2010). "India to Select Shipyard for Next Line of Submarines". Outlook.
  9. ^ "Procurement of Submarines". Press Information Bureau. 19 December 2011.
  10. ^ N. C. Bipindra (16 August 2013). "Three years on, Navy awaits Cabinet nod for 6 new subs". The New Indian Express.
  11. ^ Pandit, Rajat (9 June 2013). "Tangled in red tape, India's submarine fleet sinking". The Times of India.
  12. ^ Thapar, Vishal (4 April 2015). "5 shipyards earmarked for Rs 53,000 crore sub project". Sunday Guardian.
  13. ^ Pandit, Rajat (20 October 2017). "4 contenders left in fray for India's mega submarine project after Japan, Spain opt out". The Times of India.
  14. ^ Nair-Ghaswalla, Amrita (19 July 2017). "Six in fray for Navy's €8.3-billion advanced submarine project". The Hindu Business Line.
  15. ^ Basu, Nayanima (8 June 2017). "P75(I) submarine to be first deal under 'Strategic Partnership'". The Hindu Business Line.
  16. ^ Nair-Ghaswalla, Amrita (5 February 2018). "Indigenous submarine project still a non-starter". The Hindu Business Line.
  17. ^ "Government clears Rs 40,000 crore project to construct six submarines". The Indian Express. Press Trust of India. 31 January 2019.
  18. ^ "Indian Navy kicks off Rs 50,000 crore lethal submarine project, wants 500 km strike range cruise missiles on them". The Economic Times. Asian News International. 4 April 2019.