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Big, Bigger, Biggest
Season 2 • Episode 1 • Tunnel
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Big, Bigger, Biggest Season 2, Episode 1: Tunnel
Unearth the technological leaps forward that have allowed the world's longest tunnel - the Gotthard Base Tunnel - to be built. The Gotthard Base Tunnel stretches 57 kilometres through the heart of the Swiss Alps. It is deeper than any other tunnel on Earth and paves the way for a vital high-speed rail link between Zurich and Milan. 2000 workers and four gigantic tunnel boring machines work flat-out to excavate 24 million tonnes of mountain rock to complete the tunnel. Explore how this structure was made possible through a series of six engineering breakthroughs. See how six landmark tunnels - including the Thames Tunnel and Channel Tunnel - each feature an ingenious technological innovation that have enabled tunnels to grow ever longer. Watch Big, Bigger, Biggest Season 2, Episode 1 Tunnel in HD free online. Enjoy high-quality streaming of Big, Bigger, Biggest Season 2, Episode 1 and share your thoughts in the comments below!
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