Channel 4 News | Tokyo’s hidden flood tunnels explained @Channel4News | Uploaded October 2024 | Updated October 2024, 47 minutes ago.
Deep below the streets of Tokyo is a complicated system of tunnels - which aim to stop the city from flooding.

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The tunnels can hold almost 100 Olympic-size swimming pools of water and are critical in Japan's fight against extreme weather, fuelled by climate change.

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