Mazagon Dock Shipbuilders (MDL) is close to sealing a major submarine deal with Germany this fiscal year.
For years, the Indian Navy’s submarine fleet has faced a "capability gap"—a worrying delay in modernization while neighbors like China and Pakistan rapidly expanded their underwater assets. But the tide is turning. Reports confirm that Mazagon Dock Shipbuilders (MDL) is in the final stages of sealing a ₹70,000 crore deal with Germany’s ThyssenKrupp Marine Systems (TKMS) under Project 75I.
This isn't just about buying six new boats; it’s about a technological leap that could secure India’s maritime future for decades. Here is the deep dive into why this deal matters.
1. The Technology Leap: Fuel Cells vs. The World
The heart of this deal is a specific technology: Air Independent Propulsion (AIP).
Conventional diesel-electric submarines (like India's current Scorpene class) have a fatal flaw: they must surface or "snorkel" every few days to run their diesel engines and recharge batteries. In modern warfare, surfacing is suicide—it exposes the submarine to radar and anti-submarine aircraft.
The German Solution:
The proposed submarines (likely a variant of the Type 214) come with a Hydrogen Fuel Cell AIP system.
Endurance: It allows the submarine to stay submerged for up to three weeks without surfacing.
Stealth: Unlike nuclear submarines (which have cooling pumps that make noise) or Chinese AIP systems (which use Stirling engines with moving mechanical parts), Fuel Cell technology is virtually silent. It has no moving parts—just a chemical reaction producing electricity and water.
The Comparison:
| Feature | Scorpene Class (Current) | Project 75I (German Tech) | Chinese Yuan Class (Adversary) |
| :--- | :--- | :--- | :--- |
| Propulsion | Diesel-Electric | Hydrogen Fuel Cell AIP | Stirling Engine AIP |
| Submerged Endurance| ~2-3 Days | ~3 Weeks | ~2 Weeks |
| Acoustic Signature | Quiet | Silent (Near undetectable) | Detectable (Mechanical vibration) |
2. Strategic Checkmate in the Indian Ocean
Why does this specific tech matter now? Because the Indian Ocean is getting crowded.
The "Hangor" Threat:
Pakistan is acquiring eight Hangor-class submarines from China. These are equipped with Chinese AIP technology. Without Project 75I, the Indian Navy risked facing an adversary with superior underwater endurance in its own backyard.
The "Sea Denial" Strategy:
Project 75I submarines are "Hunter-Killers." Their primary job is Sea Denial—preventing enemy ships and submarines from entering critical zones like the Arabian Sea or the Bay of Bengal. With 3-week underwater endurance, a P-75I submarine can sit silently at a "choke point" (like the Malacca Strait entrance) and wait for enemy vessels without ever giving away its position.
3. The Bridge to "Project 76"
Critics often ask, "Why not build it ourselves?" The answer lies in the long game.
Project 75I is not the final destination; it is the bridge.
Project 75 (Scorpene): Taught India how to build submarines (welding, assembly).
Project 75I (German): Will teach India how to design and integrate complex AIP systems.
Project 76 (Future): This is the endgame. Using the Transfer of Technology (ToT) from the German deal, India plans to design and build 12 fully indigenous submarines.
By partnering with TKMS, MDL isn't just buying fish; it's learning how to fish. This deal ensures that the next class of Indian submarines will be 100% Indian-designed, finally breaking the cycle of import dependence.
The Verdict
The India-Germany submarine deal is expensive and overdue, but it is necessary. In the silence of the deep ocean, the margin between victory and defeat is measured in stealth and endurance. By securing the world’s quietest non-nuclear technology, the Indian Navy isn't just buying submarines; it is buying the silence it needs to protect the nation's future.

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