Shimla, Sept. 20 -- With Atal Tunnel, formerly known as the Rohtang Tunnel on the Manali-Leh highway, set to be opened for traffic this month-end, the Centre has set the ball rolling for the construction of another high-altitude tunnel under the 16,730-ft-high Shinku La (pass) in Himachal. The National Highways and Infrastructure Development Corporation Limited (NHIDCL) under the ministry of road, transport and highways has speeded up the detailed project report (DPR) work on the 13.5-km Shinku La Tunnel connecting the Union Territory of Ladakh and tribal Lahaul and Spiti district of Himachal Pradesh....