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WION

Gravitas: This underground tunnel protects Tokyo from floods

Duration: 07:15
Do you know Tokyo has an underground tunnel to catch flood water? It was constructed 3 decades back to save the city from drowning. WION's Managing Editor Palki Sharma visited the facility to see how it works. Here's a ground report.

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Gravitas: This underground tunnel protects Tokyo from floods

Gravitas: This underground tunnel protects Tokyo from floods

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