3 km long in Aut Tunnel : 19 May 2016 Credit : Soumita Sharma[The Himalayan Club] https://www.google.co.th/maps/place/Aut+Tunnel/@31.7208587,77.2052405,15.25z/data=!4m5!3m4!1s0x3904554f059efbe1:0x4c33cb232c198f2b!8m2!3d31.7168281!4d77.2091729
