The Metropolitan Area Outer Underground Discharge Channel or G-Cans Project at Kasukabe city, Saitama Prefecture (in the Greater Tokyo Area). It is the world’s largest underground flood water diversion facility.
Metropolitan Area Outer Underground Discharge Channel
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TOKYO Design Manhole Exhibition at Anime Tokyo Station (October 3-4, 2026)
photos: October 3, 2026 ©Japanbyweb.com /G.F.
Among the many unique things you...