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Extreme Engineering

Season 3 • Episode 5 • Gotthard Tunnel

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Extreme Engineering Season 3, Episode 5: Gotthard Tunnel

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The Gotthard Base Tunnel underneath the Swiss Alps will be the world's longest rail tunnel upon completion in 2015. Watch Extreme Engineering Season 3, Episode 5 Gotthard Tunnel in HD free online. Enjoy high-quality streaming of Extreme Engineering Season 3, Episode 5 and share your thoughts in the comments below!

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