India's next-generation conventional submarine programme designed to provide the Indian Navy with advanced diesel-electric submarines equipped with Air Independent Propulsion (AIP) for extended submerged endurance. P-75I calls for 6 submarines to be built in India under Strategic Partnership with a foreign OEM providing design and technology transfer. Key requirements include AIP for endurance exceeding 14 days submerged, heavyweight torpedoes, anti-ship missiles, land-attack cruise missiles (potentially BrahMos-M), advanced sonar and combat systems, and the ability to launch special forces. Displacement estimated at 3,000+ tonnes. The programme has been delayed by complex procurement processes but is considered critical for maintaining submarine fleet strength as older Kilo and Type 209 boats retire. Competing designs include Naval Group (France), ThyssenKrupp (Germany), Navantia (Spain), Rosoboronexport (Russia), and South Korean shipbuilders. Selection and contract award expected mid-2020s.
![Mazagon Dock Shipbuilders logo](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="200" height="60" viewBox="0 0 200 60"><rect width="200" height="60" fill="%23111"/><text x="100" y="38" font-family="Arial" font-weight="bold" font-size="14" fill="%23c8a84b" text-anchor="middle">MAZAGON DOCK</text></svg>)
- AIP provides significantly longer submerged endurance than Scorpene class
- Larger submarine enables greater weapons loadout and sensor suite
- Strategic Make-in-India program builds sovereign submarine industrial base
- Addresses critical shortfall — India targets 24 submarine force
- Program repeatedly delayed by vendor selection — no contract signed yet
- No construction started; IOC likely well into 2030s
- Technology transfer negotiations with foreign partners complex and slow
- India submarine construction track record shows consistent schedule slippage
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