India’s first and longest under-river tunnel under Brahmaputra
India is preparing to build its first underwater tunnel beneath the Brahmaputra River in Assam. The 15.6-km twin-tube tunnel project, estimated at ₹14,900 crore, has received clearance from the Public Investment Board (PIB) and is awaiting final approval from the Union Cabinet. (Image credits: AI)
15.6-km tunnel to cut travel time from 6.5 Hours to 30 Minutes
The tunnel will drastically reduce the commute between Numaligarh and Gohpur—from 240 km to just 34 km. Travel time will shrink from over 6 hours to just half an hour, boosting access to Arunachal Pradesh, Manipur, and other northeastern states. (Image credits: AI)
Twin-tube, 4-lane engineering marvel built deep beneath riverbed
Designed as two unidirectional tunnels with two lanes each, this structure will lie 32 metres below the Brahmaputra’s deepest bed level. It will be among India’s most ambitious and complex civil engineering projects to date. (Image credits: AI)
Centre to fund tunnel with Rs 14,900 crore push
Recognized for its strategic relevance near the China border, the Defence Ministry will fund 20% of the project. The remaining 80% will come from the Ministry of Road Transport and Highways, reflecting the project’s dual civilian and defence purpose. (Image credits: AI)
Assam CM’s vision inspired by Atal Tunnel
Chief minister Himanta Biswa Sarma imagined the tunnel inspired by the Atal Tunnel in the Himalayas. What began as a dream is now a nationally recognized strategic corridor, bringing the two banks of the Brahmaputra closer than ever before. (Image credits: AI)
Wildlife and environmental clearances underway
Though approved by the National Board for Wildlife, the project must still pass a series of environmental checks, including studies on sediment patterns, groundwater movement, and seismic resilience—essential for a tunnel of this scale. (Image credits: AI)
Tunnel to revolutionize defence logistics, civilian mobility
By significantly reducing travel time, the tunnel will enable faster deployment of defence personnel and equipment. It will also make civilian travel safer and more reliable during monsoon months, when ferry and bridge routes often get disrupted. (Image credits: AI)
Original plan for triple tunnel revised
An earlier proposal included three separate tunnels—for road, rail, and emergency evacuation—at an estimated ₹7,000 crore. The revised plan now focuses on a more practical twin-tube road tunnel, though the cost has doubled due to scale and safety upgrades. (Image credits: AI)
Strategic importance while rejecting similar tunnels in Jammu and Kashmir
While the Brahmaputra tunnel was greenlit, two similar projects in Jammu & Kashmir were rejected due to high costs and the availability of existing roads. This underscores the Northeast project’s unique defence and connectivity value. (Image credits: AI)
5-year construction timeline will begin under NHIDCL
After final Cabinet clearance, NHIDCL will commence the tunnel's construction, expected to take five years. This will mark a transformative shift in infrastructure for Assam and the entire Northeast, blending national security with engineering innovation. (Image credits: AI)