PM Modi inaugurates Sela Tunnel: All you need to know about world's longest twin-lane passageway near China border PM Modi Sela Tunnel inauguration: Built with a total cost of ₹825 crore by the Border Roads Organisation, the Sela Tunnel is the country's highest tunnel providing all-weather connectivity to strategic Tawang region and other forward areas bordering China near the Line of Actual Control (LAC)