Project-75 (India) submarine acquisition project

Project-75 (India)
Class overview
Name	P75I-class submarines
Builders	Mazagon Dock Shipbuilders
Operators	Indian Navy
Preceded by	Kalvari class
Succeeded by	Project 76 class
Cost	₹70,000 crore (US$8.3 billion)
Planned	6
General characteristics
Type	Attack submarine
Displacement	3,000 tonnes
Propulsion	Diesel-electric propulsion; Air-independent propulsion (AIP);
Notes	Capable of conducting - Anti-surface warfare (ASuW); Anti-submarine warfare (ASW); ISR; Special Operations Forces (SOF); Supporting operations ashore; Operating in open ocean and shallow/littoral waters;

Project-75 (India), simply referred to as the P-75(I) program, is a military acquisition initiative affiliated to India's Ministry of Defence (MoD), aimed at the planned procurement of diesel-electric submarines for the Indian Navy (IN). Originally conceived in 1997, the initiative's objective has been to procure a class of six conventionally-powered attack submarines for the Indian Navy Submarine Arm, as a replacement for the force's Sindhughosh-class submarines.

The program has experienced multiple delays owing to hurdles emanating from bureaucratic red tape, inadequate planning and a lack of corporate competitiveness, causing longstanding delays to the program's timeline, which has consequently led to intense criticism.

Originally planned to enter operational service in the late-2020s, the six submarines are now expected to be delivered by the mid-2030s. In January 2025, initial negotiations for the purchase-cum-manufacturing of six submarines designed by ThyssenKrupp Marine Systems in partnership with Mazagon Dock Shipbuilders have commenced, with approval from the MoD expected soon. As of July 2025, the commercial and technical terms of the contract is expected to be finalised soon.