![Big, Bigger, Biggest Season 2 Episode 1 Big, Bigger, Biggest Season 2 Episode 1](https://pics.soap2day.day/t/p/w185/oyUaz2LRHdQyLtPbJPVDubr2CLW.jpg)
Big, Bigger, Biggest Season 2 Episode 1 123movies
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.
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![Big, Bigger, Biggest Season 2 Episode 1](https://pics.soap2day.day/t/p/w300/3mbWvMMComo97x2PhLpGoauaecf.jpg)