The road and railway ministries, and BRO have come on board for construction of the country’s first underwater road-cum-rail tunnels across the Brahmaputra in Assam.
As per the plan, there will be three parallel tunnels—one for road, another for rail and the third for emergency use. The tunnels will be 9.8 km long each and this will be the first project where integrated tunnel construction will be undertaken. These tunnels will be inter-connected with cross passage for evacuation in case of any emergency.
The strategic multi-modal transportation system aims to integrate the rail and highway network through the Jamurihat-Silghat axis towards North Assam, Tawang and the rest of Arunachal Pradesh. This can be used for both civilian and strategic purposes.
According to the estimate, the government would spend around Rs 7,000 crore for these tunnels. Earlier NHIDCL, a company under the road transport ministry, had proposed twin tunnels only for vehicles and had estimated an expenditure of Rs 12,800 crore.
The tunnel will take off from about 9km upstream of the existing Kaliabomara (Tezpur) road bridge and it will connect with Jakhlabandha railway station on the south bank and at Dhaliabil railway station on the north bank of Brahmaputra.
At a recent meeting chaired by the CEO and chairman of the railway board, BRO submitted that these rail-cum-road tunnels are required from the strategic point of view. It also suggested that the project may be funded by the defence ministry. “After discussion on the issue, it was decided that since rail-cum-road under water tunnel alignment is an essential requirement of the ministry of defence, the same may be considered further by the Northeast Frontier Railway subject to technical suitability.
However, the cost estimate needs to be revisited by BRO and should be done carefully. The BRO/ MoRTH was also advised to confirm about funding of the project,” the minutes of the meeting said.
PM Narendra Modi has asked the road and railway ministries to plan and work together for laying the road and rail tunnels simultaneously to save cost. The underwater tunnel project will also be an engineering marvel and will benefit the country strategically by reducing travel time between Assam and Arunachal Pradesh. The proposed tunnels will be constructed using tunnel boring machines and completion may take around two to two-and-a-half years.