nhidcl/assam/record of discussion/2025 - construction of 4 lane twin tube road cum rail underwater tunnel under river brahmaputra, including 4 lane approaches along with provision of railway infrastructure in one of the tubes, in the state of assam on epc mode

National Highway Infrastructure Development Corporation Limited has invited bids for the nhidcl/assam/record of discussion/2025 - construction of 4 lane twin tube road cum rail underwater tunnel under river brahmaputra, including 4 lane approaches along with provision of railway infrastructure in one of the tubes, in the state of assam on epc mode. The estimated project cost is ₹11,982.36 Cr, with an EMD of ₹6 Cr. Interested bidders can submit applications until 30 September 2026, with the technical opening scheduled for 1 October 2026.