Today in documentaries series, we present you a new video called "World's Longest Tunnel, $10 Billion Mega Construction - Full Documentary [HD] #Advexon " documentary. You can click the title or image to visit article and watch the video. Details are in the article. Have fun watching.
Underground World | The Longest Tunnel in The World
The Gotthard Base Tunnel (GBT) is a railway tunnel through the Alps in Switzerland expected to open on 2 June 2016. With a route length of 57 km (35.4 mi) and a total of 151.84 km (94.3 mi) of tunnels, shafts and passages, it will be the world's longest and deepest traffic tunnel and the first flat low-level route through the Alps.