How did China dig a tunnel underneath the Himalayan Mountain? 中國是如何在喜馬拉雅山下挖隧道的？
https://vimeo.com/647421319
https://youtu.be/56MS37dYWYg
https://www.facebook.com/100036400039778/posts/605976833958979/?d=n
How did China dig a tunnel underneath the Himalayan Mountain?
Johnson Choi Biz 