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Metropolitan Outer Floodway Management Office Chief, Oosu Eiichi (L) and Subsection Chief, Takayuki Yabe are seen in the pressure-adjusting underground water tank during a tour of the Metropolitan Area Outer Underground Discharge Channel facility on April 8, 2015 in Tokyo, Japan. The Metropolitan Area Outer Underground Discharge Channel is the world's largest underground flood diversion facility. The facility takes water overflow from four rivers and redirects it 50 meters underground into a 6.3 kilometer tunnel before being pumped into the Edo river. Construction of the facility began in 1993 and became fully operational 13 years later in 2006. (Photo by Chris McGrath/Getty Images)
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