PM Modi Inaugurates World Longest ‘Atal Tunnel’ On Saturday. Atal Tunnel is the first step towards all-year connectivity to Ladakh. A significant link is the Nimu-Padum-Darcha road axis that will connect Leh through the Shinku La pass. The road is under construction. The tunnel provides a strategic advantage to the country’s armed forces by providing year-long connectivity to border areas. The all-weather tunnel is also a blessing for the nearly three lakh residents of Ladakh as it would help them remain connected with the rest of the country throughout the year. For tourists, the 9-km-long tunnel will shorten the distance from Manali to Lahaul and Spiti districts by several kilometres. The road has a huge strategic significance. The Atal Tunnel along with the Nimmu-Padum-Darcha road, which is also expected to be completed soon, will facilitate faster mobilisation of troops and supplies to our borders. Military sources said that it will save an entire day for troops and supplies as they move towards forward posts.