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G-Cans the World's Largest Drain

Saitama, Japan | Subterranean Sites The G-Cans project (Shutoken Gaikaku Housui Ro or Metropolitan Area Outer Underground Discharge Channel) is a massive underground waterway and water storage area built by the Japanese government to protect Tokyo from flooding during the monsoon seasons. Begun in 1992, the two billion dollar project will be finished in 2009. The tunnels run over 100 km, but perhaps the most impressive features of the drainage system are the 213-foot-tall silos and the 83-foot-tall, 580-foot-long pillared main tank known as the "Underground Temple," which was built to collect run-off from the city's waterways.
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