The Atal Tunnel, which reduces the distance between Manali and Leh by 46 km and the travel time by four to five hours, is a 9.02-km-long tunnel. It connects Manali to Lahaul-Spiti valley throughout the year. Earlier the valley was cut off for about six months each year owing

source https://news.abplive.com/videos/news/india-pm-modi-to-inaugurate-atal-tunnel-on-saturday-1353415