World's Toughest Tunnels
Season 7 / Episode 2
A team of engineers overhauls London's underground infrastructure to build a world-class sewer system; using cutting-edge tech and the latest construction methods, they work to transform a centuries-old network into a modern-day masterpiece.
Genre - Science/Technology
Running Time - 1h
Country - GBR
Language - en-GB
Original Air Date - Wednesday 8th January 2020
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