Nandni tunnels are the series of four tunnels in Udhampur district in the Indian state of Jammu and Kashmir completed in 2015. They are located beneath the Nandni wild life sanctuary at a combined length of 1.4 km.
The tunnels reduced the distance and travel time between Jammu and Udhampur by bypassing 6.8 km of curvy road with 3.6 km of with straight bridges and tunnels.
References
Nandni tunnels Wikipedia(Text) CC BY-SA