Photo and caption by Mitsuru Itou
This place was built for the preventing a flood disaster. The Metropolitan Area Outer Underground Discharge Channel is an underground water infrastructure project in Kasukabe, Saitama, Japan. It is the world's largest underground flood water diversion facility, built for preventing overflow of the city's major waterways and rivers during rain and typhoon seasons. This photo shows drainage pump. It can pump up to 50 cubic meters of water into the Edo River per second. I felt this place like a shrine under the ground. And I felt strong centripetal force.