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Chapter 1
London’s Thames Tideway Tunnel
A remarkable transformation is taking place beneath the UK capital. A 25km-long tunnel has been bored under the Thames to collect waste, which can then be treated before entering the river. Lead architect Clare Donnelly talks us through the Thames Tideway project.
14 minutes
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Chapter 2
Toronto’s underground walkway
Amy van den Berg takes us underground in Toronto to explore the ‘Path’ underground walkway network, which keeps residents warm as they stroll around the city.
3 minutes
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Chapter 3
Naples’ Catacombs of San Gennaro
Isabella Jewell explores the Catacombs of San Gennaro to find out how a group of young Neapolitans are using them to help revive the neighbourhood above.
11 minutes
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