Impossible Engineering S2E5: World's Longest Tunnel
- Aired: 2016-04-13
- Time: 21:00:00
- Runtime: 60 minutes
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Overview
How did engineers move mountains to build the longest and deepest rail tunnel on the planet? Discover how 25 million tons of rock were moved to build this modern wonder. The Gotthard Base Tunnel has a length of 35.47 miles through the Alps in Switzerland. It opened on 1 June 2016.