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A picture made available on 29 July 2014 shows a Tokyo Metropolitan Government employee lighting a large underground regulating reservoir in Tokyo, Japan, 28 July 2014. Tokyo will host the 2020 Summer Olympics. As the city is preparing for the games, disaster prevention measures are taken, after experts predicted a 70 percent chance that the Tokyo area would be hit by a M7 earthquake within 30 years. Heavy rains in summertime due to typhoons and concentrated rainfalls are also a concern that have already caused numerous floods in central Tokyo. The city is building massive underground regulating reservoirs that protect the megalopolis from flooding and the High Tide Management Center protects the waterfront from tsunamis and high tide. Among measures to prevent flooding, the city has built a system of massive underground tunnels acting as regulating reservoirs. It took 20 years to build the Kanda River Underground Regulating Reservoir Under Loop Road 7. The 4.5 kilometers long, 12.5 meters wide and 40 meters deep tunnel can store up to 540,000 cubic meters of water from the Kanda river when it reaches flooding levels. EPA/FRANCK ROBICHON