India’s Project 76 Submarine Program How It Will Revolutionize Indigenous Naval Warfare Capabilities

To give a befitting reply to the increasing naval activities of China and Pakistan in the Indian Ocean Region (IOR), India has taken a major and decisive step towards completely indigenizing and modernizing its underwater strike capability. India’s ambitious ‘Project-76’ submarine program is a huge leap forward in indigenous naval capability. The main objective of this flagship program being prepared under the Self-reliant India framework is to replace the aging ‘Sindhughosh-class’ (Russian-built Kilo-class) submarines in the Indian Navy’s fleet and replace them with new generation state-of-the-art diesel-electric hunter-killer submarines.

Submarines will be equipped with state-of-the-art AIP and lithium-ion batteries

These submarines, being developed under the leadership of Defense Research and Development Organization (DRDO) and Warship Design Bureau of the Indian Navy, will weigh about 3,000 tonnes. The biggest feature of this project is the indigenous ‘fuel-cell based Air Independent Propulsion’ (AIP) system used in it. This technology gives the submarine the ability to remain underwater for long periods of time without surfacing.

This EIP system will be integrated with high-capacity Lithium-ion batteries. Lithium-ion batteries charge faster than traditional lead-acid batteries, provide greater energy density and ensure great performance for longer periods of time. With the combination of these two technologies, India’s new submarines will be able to patrol underwater continuously for more than 20 days completely hidden, which is very important for strategic advantage in a vast area like the Indian Ocean.

Vertical launch system and precise stealth technology

State-of-the-art stealth technologies are being used in the design of the submarines being built under Project-76, due to which their acoustic signature (sound occurring under water) will be greatly reduced. Due to this, enemy sonar or warships will not be able to track them easily.

To make the attack capability lethal, it will be fitted with Vertical Launch System (VLS). Through this system, submarines will be able to fire long-range land-attack cruise missiles at enemy land targets from underwater. Apart from this, being equipped with heavy weight torpedoes, they will prove to be perfect in both defensive and offensive roles. This dual capability will give India excellent options for both ‘Sea-Denial’ (preventing the enemy from using sea lanes) and ‘Strategic Strike’ (strategic attacks).

Mazagon Dock and L&T will jointly build 12 submarines; ₹70,000 crore budget

To complete this mega project on time, the government has planned to divide the construction work between two major indigenous shipyards. Under this, Mazagon Dock Shipbuilders Limited (MDL) and Larsen & Toubro (L&T) will be given the responsibility of building six submarines each. This parallel production approach is aimed at reducing the time taken for delivery of submarines so that the Navy can get these powerful submarines within the stipulated time frame.

The production order for the project is expected to be issued around 2028, while the first submarine is likely to be commissioned into the Navy by 2034. On the economic front, the estimated cost of the entire program is around ₹70,000 crore, making it one of the largest defense investments in India’s history.

Sea trials will take place on INS Khanderi in 2026

To fully test and validate the technologies of Project-76, sea trials of the indigenous AIP Module are scheduled to be conducted on Naval submarine INS Khanderi in late 2026. After the success of this test, the way will be cleared to directly integrate this technology in new submarines.

Masterplan to stop China-Pakistan

Project-76 is actually an important part of India’s comprehensive submarine modernization roadmap. The Indian Navy is to get a total of 24 new submarines under the three-decade long-term Submarine Building Perspective Plan approved by the Cabinet Committee on Security (CCS). Project-76 is the second phase of this scheme, which is completely focused on indigenous design and manufacturing.

At present, this project along with other two big programs of India will fulfill the shortcomings of the Navy. The first of these is ‘Project-75I’, under which German-designed AIP submarines are being built, and the second is ‘Project-77’, which will provide nuclear-powered indigenous attack submarines (SSNs) to the Navy. The arrival of these 12 advanced submarines will not only replace India’s aging assets, but will also emerge as the strongest pillar of India’s maritime security strategy in the Indo-Pacific region.

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