It's another wonder of the world for me at least. The Erh Lung Shan Tunnel is ony 4 kolimeters long. There are lots of snow and very cold on one end and very dry and clean on the other. All vehicles have to put chains on the wheels to avoid slippery when upon arriveal at the other end on the downward journey. Similarly, all vehicles have to unchain the wheels upon arrival at the entrance of the tunner before going through it on the upward trip. See how much snow and iccicles at the snow end of the tunner as shown in the pictures. We have lots of fun and photography at this end. The other end is bland and un-inviting. It is said that a a barrier of mountains prevented the cold front reaching the other end from Siberia. Cheers