The staff of Metropolitan Outer Floodway Management Office looks around a pressure-adjusting water tank, part of an underground water discharge tunnel which was constructed to protect Tokyo and its suburb areas against floodwaters and overflow of the city's major waterways and rivers during heavy rain and typhoon seasons, at the facility in Kasukabe, north of Tokyo, Japan August 29, 2018. (Photo by Toru Hanai/Reuters)
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