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A shaft, which channels flood water, stands in the Metropolitan Area Outer Underground Discharge Channel in Kasukabe City, Saitama Prefecture, Japan, on Wednesday, Nov. 21, 2012. The facility called 'Underground Temple' was constructed to protect the capital Tokyo against flooding and is one of the largest underground water diversion facilities in the world. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

A shaft, which channels flood water, stands in the Metropolitan Area Outer Underground Discharge Channel in Kasukabe City, Saitama Prefecture, Japan, on Wednesday, Nov. 21, 2012. The facility called 'Underground Temple' was constructed to protect the capital Tokyo against flooding and is one of the largest underground water diversion facilities in the world. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images