India to Build Its First Underwater Road-Rail Tunnel at ₹18,000 Crore

India is set to embark on a landmark infrastructure venture its first-ever underwater road-and-rail tunnel with an estimated project cost of ₹18,000 crore. The ambitious development is expected to transform regional connectivity, reduce travel time, and strengthen economic corridors in the project zone.

Government officials describe the tunnel as a strategic step toward modernizing transport infrastructure while integrating advanced engineering solutions.

A First for Indian Infrastructure

The proposed tunnel will allow both road vehicles and trains to pass beneath a water body, marking a significant engineering milestone for the country. While India has completed long rail and highway tunnels through mountains, an underwater dual-purpose tunnel represents a new frontier.

Experts say the project will incorporate global tunneling technologies, including waterproof concrete lining, pressure-resistant structures, and advanced ventilation systems.

Strategic Connectivity Boost

The tunnel is expected to link key urban and industrial hubs separated by water, offering a faster and more efficient alternative to existing ferry or bridge routes. By cutting travel time substantially, the project could enhance trade logistics and daily commuting.

Officials believe the tunnel will also improve disaster resilience by offering an all-weather transport option.

Engineering and Safety Measures

Building underwater requires precise geological surveys and cutting-edge boring equipment. Engineers are likely to deploy Tunnel Boring Machines (TBMs) designed to operate in high-pressure marine environments.

Safety systems are expected to include emergency evacuation routes, fire-resistant linings, real-time monitoring sensors, and high-capacity drainage mechanisms to prevent water ingress.

Economic Impact and Job Creation

Large-scale infrastructure investments often stimulate local economies. The ₹18,000 crore project is anticipated to generate thousands of direct and indirect jobs during construction, alongside long-term benefits for tourism and commercial activities.

Urban planners suggest that surrounding property markets and business districts may also witness growth following improved accessibility.

Environmental Considerations

Authorities will conduct detailed environmental impact assessments before and during construction. Marine ecosystems, water flow patterns, and coastal stability will be carefully monitored to minimize ecological disruption.

Balancing infrastructure growth with environmental protection remains a key priority.

The Bottom Line

India’s first underwater road-rail tunnel signals a bold leap in engineering ambition. With a ₹18,000 crore investment and advanced safety planning, the project aims to redefine coastal connectivity while reinforcing the nation’s expanding infrastructure footprint. If executed as planned, it could become one of the most iconic transport projects in the country’s history.