Visit Japan: Introducing the world’s largest underground flood diversion facility in the town…

Introducing the world’s largest underground flood diversion facility in the town of Kasukabe, Saitama Prefecture. Fifty metres below ground level lurks an incredible feat of engineering. 😎 Several times a year, water from heavy rains is diverted to prevent flooding in the watershed and urban areas north of Tokyo. Perhaps obviously, on rainy days no visitors are allowed. ☔ ⁠
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