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
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. As of 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.