Beneath Tokyo hides an 'underground temple' the size of a cathedral, 59 towering pillars in a vast concrete cavern that swallow floodwater to keep the megacity from drowning
Japan's Metropolitan Area Outer Underground Discharge Channel protects Tokyo from floods. This massive underground structure diverts excess stormwater into the Edo River. Construction began in 1993 and the system became fully operational in 2009. The facility's immense pressure-adjustment chamber features 59 concrete pillars. This hidden engineering marvel safeguards a densely populated metropolitan area.
Japan's Metropolitan Area Outer Underground Discharge Channel protects Tokyo from floods. This massive underground structure diverts excess stormwater into the Edo River. Construction began in 1993 and the system became fully operational in 2009. The facility's immense pressure-adjustment chamber features 59 concrete pillars. This hidden engineering marvel safeguards a densely populated metropolitan area.
