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Project 75 and Indigenous AIP System: A Strategic Leap for India's Submarines

Project 75 is an ambitious initiative by the Indian Navy aimed at bolstering its submarine fleet with advanced diesel-electric Scorpène-class submarines. A critical aspect of enhancing these submarines' operational capabilities is the integration of an Air Independent Propulsion (AIP) system. India’s indigenous AIP technology, developed by the Defence Research and Development Organisation (DRDO), is nearing operational readiness, signaling a significant milestone in the nation's quest for self-reliance in defense technologies.

What is an AIP System?

An Air Independent Propulsion (AIP) system enables conventional submarines to remain submerged for extended durations without surfacing to recharge batteries. This is particularly advantageous for stealth operations, as snorkeling increases the risk of detection. AIP systems generate power underwater by utilizing hydrogen and oxygen to drive fuel cells, which produce electricity as well as water as a by-product.

The DRDO's AIP is based on Phosphoric Acid Fuel Cell (PAFC) technology, known for its high efficiency, low acoustic signature, and compact design.

Development of India’s Indigenous AIP System

The development of the indigenous AIP system has been spearheaded by the DRDO's Naval Materials Research Laboratory (NMRL). Key milestones include:

  1. Successful Land-Based Trials: Conducted in 2021, these trials validated the AIP system's performance and scalability.
  2. Compact Integration: Designed to fit seamlessly into the Scorpène-class submarines, ensuring minimal disruption during retrofitting.
  3. Enhanced Endurance and Stealth: The system allows submarines to operate silently underwater for extended periods, crucial for missions in contested maritime regions.

AIP System for Project 75 Submarines

India's Project 75 involves the construction of six Scorpène-class submarines in collaboration with the French company Naval Group. While these submarines are currently equipped with diesel-electric propulsion systems, the indigenous AIP system will be retrofitted into the fleet during their mid-life upgrades.

Why AIP is Critical for Project 75 Submarines

  • Extended Underwater Endurance: AIP will allow these submarines to stay submerged for longer without surfacing for air, increasing their stealth.
  • Strategic Advantage: Enhanced endurance enables the submarines to patrol sensitive areas, such as the Indian Ocean, undetected for extended periods.
  • Self-Reliance: The indigenous AIP aligns with the Atmanirbhar Bharat (Self-Reliant India) vision, reducing dependency on foreign technology.

Current Status: Closer to Reality

The indigenous AIP system is expected to be operationally ready by 2025. It is undergoing final evaluations to ensure compatibility and reliability under operational conditions. The Navy has planned retrofitting for the Scorpène-class submarines during their mid-life upgrades.

Additionally, the system is poised to play a crucial role in Project 75(I) (a follow-up to Project 75), which focuses on acquiring advanced next-generation submarines. The availability of a proven indigenous AIP system strengthens India’s position as a capable and self-reliant defense technology developer.

Significance of the Indigenous AIP System

  1. Maritime Security: The Indian Ocean is a contested region, and the AIP system enhances India's deterrence capabilities against adversaries.
  2. Economic Efficiency: Retrofitting existing submarines with indigenous AIP modules is more cost-effective than procuring entirely new platforms.
  3. Global Recognition: With the successful development of this technology, India joins an elite group of nations capable of producing advanced submarine propulsion systems.
  4. Future-Ready: The AIP system is designed not only for retrofitting but also for integration into future platforms, ensuring long-term utility.

Conclusion

India’s indigenous AIP system under Project 75 represents a transformative step in enhancing the Navy's underwater warfare capabilities. By enabling submarines to operate stealthily for extended durations, the AIP system strengthens the country's maritime security while reducing reliance on foreign technology.

As this system moves closer to deployment, it underscores India's growing expertise in defense innovation and reinforces its commitment to securing its maritime boundaries with cutting-edge indigenous technology.

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