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Stone pillars stand in the surge tank area of 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

Stone pillars stand in the surge tank area of 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