The Sewer Map of Britain

Take a deep dive with this documentary investigating the hidden secrets of one of our oldest, and most crucial, networks - the sewers.
A tour of the latest solution - London's Tideway Tunnel - reveals its staggering scale - a 16-mile-long storage tank to hide sewage beneath the river Thames.
There is also a trip to Hadrian's Wall to marvel at how the Romans handled the sewage issue almost 2,000 years ago.

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