Nandni tunnels

Nandni tunnels are the series of four highway tunnels built under Nandni wild life sanctuary on Jammu-Srinagar National Highway in Udhampur district, Jammu and Kashmir. At a combined length of 1.4 km, (coordinates: )
The tunnels have reduced the distance and travel time between Jammu and Srinagar by bypassing 6.8 km of rugged Mountainous area with 3.6 km of with straight bridges and tunnels. 
They were built by Afcons Infrastructure a subsidiary of the Shapoorji Pallonji Group.