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Tokyo Flood Prevention | Insane underground tunnel system in Japan!

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Fifty metres under Tokyo lies a subterranean world — 6.4 kilometres of tunnels, water tanks and massive pillars constructed to withstand 200 tonnes of water per second. This engineering marvel built to protect the ever-present threat of Tokyo flooding. Subscribe to ABC Science YouTube 👉 Australians can watch Catalyst on ABC iview: This is an official Australian Broadcasting Corporation YouTube channel. ******** Contributions may be removed if they violate ABC’s Online Conditions of Use (Section 3).

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