Project 75I-class submarine

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Class overview
Name: Project 75I-class (code name)
Operators:  Indian Navy
Preceded by: Kalvari-class submarine
Cost: $8 billion[1]
Planned: 6
General characteristics
Type: Attack submarine
Propulsion: Diesel-electric and AIP
Armament: torpedo tube and VLS cells

The Project 75I-class submarine is a follow-on of the Project 75 Kalvari-class submarine for the Indian navy.[1] Under this project, the Indian Navy intends to acquire 6 diesel-electric submarines, which will also feature advanced Air-independent propulsion (AIP) systems to enable them to stay submerged for longer duration and substantially increase their operational range.[1][2] In October 2014, the project got clearance from Defence Acquisition Council.[3] All six submarines are expected to be constructed in Indian shipyards.[2]


In October 2008, the Indian Navy issued a Request for Information (RFI) to a number of foreign shipyards and design firms for construction of a class of advanced diesel-electric submarines. The RFIs were sent to Rosoboronexport, Armaris and HDW, among others.[1][4] Originally the navy intended to purchase two submarines directly from the foreign vendor, with four licence-built at chosen local Indian shipyards in order to save time.[5] Acceptance of Necessity was accorded to the project by the Defence Acquisition Council in August 2010.[6] In December 2014, the new NDA government fast-tracked the bidding process for Project 75I due to mounting concerns over increasing People's Liberation Army Navy activities in the Indian Ocean region.[1][7] and diminishing submarine strength of the Indian navy.[8] Later it was decided to construct all six submarines in Indian shipyards in accordance with the Make in India initiative of the government.

BrahMos shown at IMDS 2007


The Project 75I-class submarines will have a vertical launch system (VLS) to enable them to carry multiple Brahmos supersonic cruise missiles, making the submarines fully capable of anti-surface and anti-ship warfare missions.[citation needed] Project 75I submarines will also be armed with torpedoes and will feature advanced stealth capabilities such as a greater ability to suppress noise and acoustic signatures.[3] Submarines will also be outfitted with Air-independent propulsion (AIP) fuel cells which can significantly increase submerged endurance and operational range.[9]


After years of delays,[5] in October 2014, Project 75l was cleared by the Defence Acquisition Council. 53,000 crore (US$8 billion) was allocated for the acquisition of 6 advanced attack submarines.[3] During the bidding process, a high-level committee was set up by the Ministry of Defence (MoD) to inspect and assess the capabilities of different local shipyards to undertake the building of six submarines. The committee shortlisted 5 shipyards which include Hindustan Shipyard, Mazagon Dock, Garden Reach Shipbuilders and Engineers (GRSE), Larsen & Toubro and Pipavav Shipyard. These shipyards are expected to be submitting their bids in partnership with an international shipyard and the Indian navy will choose a design and shipyard which meets its specifications.[10][11]

In July 2017 the RFI (Request for Information) was issued to six submarine builders, and bids were requested to be filed by 15 September 2017, Spain and Japan did not submit responses to RFI and hence seen as opted out of the competition.[12][13] The complete process of selection of a local shipyard and its foreign collaborator could take as much as two years.[12][13][14]


Name Picture Origin Cost Displacement Range Speed Armament
Type 214 submarine S-120 Papanikolis 1.jpg Germany $330 million 1,860 tonnes (submerged) 12,000 miles (19,300 km) surfaced

420 nmi (780 km) @ 8 kt 1,248 nmi (2,311 km) @ 4 kt

20 knots (37 km/h) submerged Torpedoes

Harpoon missiles

Amur-class submarine BrahMos missie on Lada class non-nuclear submarine maqette.jpg Russia $450 million 1,060 tonnes (surfaced)[15] 350 nmi (650 km) AIP

3,000 nmi (5,600 km) Snorkel

20 knots (37 km/h) submerged 16 Torpedoes

10 Brahmos (VLS Cells)

A26 submarine Sweden 1,930 tonnes Torpedoes
Scorpene class submarine INS Kalvari at the Mazagon Dock Limited on the day of her undocking (4).JPG France $450 million 2,000 tonnes(submerged) 550 nmi (1,020 km; 630 mi) at 5 kn (9.3 km/h; 5.8 mph) (submerged) 20 knots (37 km/h; 23 mph) (submerged) Torpedoes and Exocet Anti-ship missiles.

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