P75I Scorpene Class Attack Submarines

The Indian Navy’s Project 75I (P75I) Scorpene submarine development for six latest-generation attack boats is expected to be completed by 2022.

Project Type

Attack submarines


Mazagon Dock Limited


Indian Navy


Between 25 and 31


The Indian Navy’s Project 75I (P75I) Scorpene submarine development for six latest-generation attack boats is expected to be completed by 2022.

The P75I Scorpene class diesel-electric / air-independent propulsion (AIP) submarines are based on the Scorpene class submarines, which were designed by French naval shipbuilding firm DCNS in partnership with Spanish shipbuilding firm Navantia.

The new submarines are being built by Mazagon Dock in Mumbai, India, using the technology and training provided by DCNS.

The Indian Navy intends to use the submarines for missions such as area surveillance, intelligence gathering, anti-submarine warfare, anti-surface warfare and minelaying operations.

Named INS Kalvari, the first submarine in the class was undocked at Mazagon Dock in April 2015 and was launched in Mumbai, India, in October that year. Sea trials of the INS Kalvari began in May 2016 and the submarine underwent weapon, surface, noise and diving trials prior to her commissioning in December 2017.

INS Khanderi is the second submarine in the class and was launched in January 2017. It is currently undergoing sea trials, with its commissioning scheduled for the end of 2019.

The third Scorpene class submarine is INS Karanj, which was launched in January 2018 and is currently undergoing sea trials. The launching ceremony of the fourth submarine INS Vela was held in May 2019.

The Scorpene class submarines have also been acquired by the naval forces of Chile, Malaysia and Brazil.

P75I Scorpene Class design and features

The P75I Scorpene class features pressure hull and superior stealth capabilities. It accommodates between 25 and 31 crew members as well as 14 combat divers. The submarine has a width of 6.2m, a length of 67m and a submerged displacement of 1,550t.

DCNS’ SUBTICS integrated combat system enables operation and control of all on-board sensors, weaponry and radars from multifunction common consoles. The motion of the submarine is controlled by a steering system using rudder and hydroplanes.

P751 Scorpene Class Weaponry

The P75I Scorpene class submarines are armed with six torpedo launching tubes, 18 heavy weapons, tube-launched MBDA SM-39 Exocet anti-ship missiles and precision-guided weapons. The weapons are carried in weapon launching tubes and can be easily reloaded at sea.

The submarine can launch crippling attacks on surface and underwater enemy targets.

Sensors onboard the P75I Scorpene Class

The Thales-developed on-board S-CUBE integrated and modular submarine sonar suite offers increased safety against a wide variety of threats in deep or coastal waters. It comprises sonar arrays, including bow, stern, planar flank, intercept, distributed, towed and active, mine and obstacle avoidance sonar, as well as self-noise-monitoring hydrophones.

The submarine is also equipped with Sagem surveillance and radars.

P75I Scorpene Class propulsion and performance

The submarines in the P75I Scorpene class are powered by conventional diesel-electric propulsion systems. The last two submarines are expected to be equipped with AIP technology, which is developed by DRDO to provide long-range and extended endurance capabilities. The submarines are also installed with batteries.

“The Indian Navy intends to use the submarines for missions such as area surveillance, intelligence gathering, anti-submarine warfare (ASW), anti-surface warfare (ASuW), and minelaying operations.”

The propulsion, electricity, auxiliary and safety systems on board the submarine are controlled using a platform management system.

The attack submarines can travel at a maximum submerged speed of approximately 20kt and have the ability to remain submerged for 21 days. The P75I Scorpene class has a diving depth of more than 350m.

Contractors involved with the P75I Scorpene submarines programme

Flash Forge India received a contract from DCNS India in June 2011 for the supply of equipment.

SEC Industries secured a contract from DCNS India, a subsidiary of DCNS, to supply highly technological equipment for the P75I Scorpene submarines programme in September 2011.

In March 2012, DCNS awarded a €50m ($65.9m) contract to SEC Industries to supply equipment such as hull hatches, ballast vent valves, weapons handling, storage systems and high-pressure air cylinders.

The command consoles are manufactured by HBL Power Systems.

The Global Naval Submarines Market 2011-2021

This project forms part of our recent analysis and forecasts of the global naval submarines market available from our business information platform Strategic Defence Intelligence. For more information click here or contact us: EMEA: +44 20 7936 6783; Americas: +1 415 439 4914; Asia Pacific: +61 2 9947 9709 or via email.

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