The Sela Tunnel, currently under construction, is a road tunnel located at an elevation of 3,000 meters (9,800 ft). Its purpose is to establish all-weather connectivity between Guwahati in Assam and Tawang in the Indian state of Arunachal Pradesh. Once completed, this tunnel will hold the distinction of being the longest bilane tunnel in the world, spanning a length of 13,000 feet.
It is worth noting that the Nechiphu road tunnel is the first road tunnel in Arunachal Pradesh and also the first road tunnel in the entire northeastern region of India. The Sela tunnel is being excavated beneath the Sela Pass, which stands at an altitude of 4,200 meters (13,800 ft), along the NH 13 component of the Trans-Arunachal Highway system. To connect with NH 13, a new 12.4 km road will be constructed, effectively reducing the distance between Dirang and Tawang by 10 km. The target completion date for this project is February 2022, with construction having commenced in 2019. Once finished, the Sela Tunnel will provide year-round access to Tawang via a reliable road network in the western region of Arunachal Pradesh.
