MDL Challenges DRDO with Independent Submarine Design for India's Project-76

Mazagon Dock Shipbuilders Limited (MDL), India’s premier submarine construction yard, has stepped forward with a bold and strategic move—designing its own conventional diesel-electric submarine for the Indian Navy’s future Project-76. This marks the first time MDL is independently developing a submarine from the ground up, without relying on a foreign partner or a government research body.

This initiative directly places MDL in friendly but firm competition with the Defence Research and Development Organisation (DRDO), which is also working on its own indigenous submarine design under the same program. Project-76 is envisioned to produce a new line of advanced submarines equipped with Air-Independent Propulsion (AIP), and aims to serve as a major step in India’s push toward self-reliance in defence manufacturing.

MDL confirmed on March 18, 2025, that its internal design team is actively engaged with the Indian Navy to shape a proposal that fits the service’s long-term needs. The company hopes to present its design around the same time as DRDO’s, ensuring that the Navy has two separate but homegrown options to choose from—both tailored to Indian requirements.

What makes MDL’s move particularly significant is its rich legacy in submarine construction. Based in Mumbai, MDL has built both the German Shishumar-class submarines in the 1980s and the French-designed Scorpene-class submarines under the ongoing Project-75. It has already delivered five Scorpenes to the Navy, with the sixth nearing completion. The shipyard is also preparing to construct six more AIP-equipped submarines under Project-75I, in collaboration with Germany’s Thyssenkrupp Marine Systems (TKMS).

This deep experience puts MDL in a unique position. While DRDO approaches submarine development from a research and systems design perspective—leveraging its work on nuclear-powered submarines and indigenous AIP technology—MDL brings decades of hands-on shipbuilding and integration expertise. This contrast sets the stage for a constructive competition that could ultimately benefit the Indian Navy.

Interestingly, while DRDO has reportedly sought Cabinet approval and government funding for its design phase, MDL is taking a different route by financing its design work internally. This bold step underscores MDL’s confidence in its own capabilities, both technical and financial.

The Indian Navy, which currently operates 16 conventional submarines (a mix of Kilo, Shishumar, and Scorpene classes), is in pressing need of modernization. Many of these boats are aging and will need replacement in the coming decade. The Navy aims to operate 18 conventional and six nuclear attack submarines by 2035. The availability of two competing Indian designs around that time could help avoid delays and offer more flexibility in fleet expansion.

There’s also speculation that MDL’s new design could integrate valuable insights from its Scorpene program and its upcoming collaboration with TKMS on the German Type 212/214 platforms. Such features could enhance stealth, endurance, and weapon systems, making the submarine highly suited to India’s unique maritime geography.

While some argue that DRDO and MDL should collaborate to conserve resources, others believe that healthy competition could actually push both teams to deliver better results—just as it has in defence programs in countries like the United States. Both organizations are leveraging their strengths: DRDO’s cutting-edge research base and its link with the Warship Design Bureau, and MDL’s practical, proven shipbuilding capability.

As Project-76 takes shape, this parallel development race could become a landmark moment for India’s defence sector—one that exemplifies the spirit of ‘Atmanirbhar Bharat’ and brings the country closer to self-sufficiency in critical undersea warfare capabilities.