Impossible Engineering Season 2 Episode 5 World's Longest Tunnel 2016
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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.
- Released: 2016-04-13
- Runtime: 42 minutes
- Genre: Documentary
- Stars: Mike Bratton
- Director:
