Impossible Engineering - Season 7 (2020) (season)
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A team of engineers are overhauling 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. (Science Channel)
Gallery (12)
Photo © Discovery Networks
![Impossible Engineering - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722138_rj918p.jpg)
Photo © Discovery Networks
![Impossible Engineering - World's Toughest Tunnels - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/168/722/168722139_pvloaq.jpg)