
The Union Cabinet has approved a landmark ₹18,662 crore project to build India’s first underwater road-cum-rail tunnel beneath the Brahmaputra River in Assam.
What Assam’s Brahmaputra project represents is India’s first underwater road-cum-rail tunnel, and one of only a handful globally.
Assam’s Chief Minister described it as the world’s second underwater road-rail tunnel, after the Fehmarnbelt Fixed Link between Germany and Denmark, which is longer and still under construction. So, while it’s not the longest, it is among the most ambitious and unique — especially because it combines both road and rail under a major river in a seismic zone.
Project Details
- Length & Design: 15.79 km twin-tube tunnel, part of a 33.7 km greenfield corridor connecting Gohpur (NH-15) to Numaligarh (NH-715).
- Depth: Tunnel will sit about 32 meters below the riverbed.
- Capacity: Two road lanes in each direction, plus provision for a railway line.
Impact
- Travel Time: Reduces current 240 km detour (~6 hours) to just 34 km, cutting travel time to about 20 minutes.
- Economic Boost: Expected to generate 80 lakh person-days of employment and enhance freight, tourism, and security near the Indo-Tibet border.
- Strategic Importance: Strengthens connectivity in the Northeast, supports the Act East Policy, and adds Assam’s fourth rail crossing over the Brahmaputra.
Political & Regional Significance
- Assam Chief Minister Himanta Biswa Sarma hailed it as a historic milestone, thanking PM Narendra Modi and Minister Nitin Gadkari for advancing regional connectivity.










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