Brahmaputra Underwater Tunnel Links NH-15 and NH-715

The Cabinet Committee on Economic Affairs approved India’s first underwater twin-tube road–rail tunnel in Assam over the Brahmaputra region. The project aims to enhance regional connectivity and multi-modal integration in Northeast India.

Underwater Twin-Tube Road–Rail Tunnel (Assam):

Dimension	Key Details
Location	Assam in the Brahmaputra river region
Approval Authority	Cabinet Committee on Economic Affairs
Connectivity Corridor	Connects Gohpur on NH-15 with Numaligarh on NH-715 as part of a 4-lane access-controlled greenfield corridor
Total Length	33.7 km
Underwater Section	Twin tubes of 15.8 km
Project Cost	₹18,662 crore
Construction Mode	Engineering, Procurement and Construction mode
Distance & Time Impact	Reduces distance from 240 km to 34 km and travel time from 6 hours to 20 minutes
Rail Integration	Integrates Rangia–Mukongselek section and Furkating–Mariani loop line
Employment Generation	Provides about 80 lakh person-days of direct and indirect employment
Major Nodes Connected	Includes airports at Donyi Polo Holongi and Tezpur, four railway stations and inland waterway terminals at Biswanath Ghat and Tezpur
Tourist Nodes	Kaziranga National Park and Deopahar Archaeological Site