Longest Tunnel in The World (Video)

Check out the massive engineering and planning undertaken to construct the longest tunnel in the world, also known as the Gotthard Base Tunnel (GBT), a railway tunnel through the Alps in Switzerland.

Source: Largest Dams on YouTube.

 

LEAVE A REPLY

Please enter your comment!
Please enter your name here

 
30,301FansLike
76FollowersFollow
4FollowersFollow