A team of engineers is overhauling London's underground infrastructure to build a world-class super-sewer system, the Thames Tideway Tunnel. Using cutting-edge tech and the latest construction methods, they work to transform a centuries-old network into a modern-day masterpiece. |
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Title: | World's Toughest Tunnels | |
Air Date: | January 8, 2020 | |
Runtime: | 60 min | |
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