Japan’s Metropolitan Area Outer Underground Discharge Channel is a colossal flood control system stretching 6.

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Japan’s Metropolitan Area Outer Underground Discharge Channel is a colossal flood control system stretching 6.3 kilometers (3.9 miles) beneath Tokyo’s suburbs. Located in Saitama Prefecture, it features 5 massive silos—each 65 meters tall and 32 meters wide—linked by underground tunnels and ending in a massive water tank the size of a soccer field.

Completed in 2006 after 13 years of construction, this engineering marvel protects the Tokyo metropolitan region—home to over 13 million residents—from seasonal typhoons and torrential rainfall. It can pump 200 tons of water per second into the Edo River using giant turbines powered by jet engines from a Boeing 737.

Beyond its life-saving utility, the vast main tank—nicknamed the “Underground Temple”—has become a popular tourist and filming location due to its awe-inspiring architecture.

,TokyoFloodTunnels ,UrbanEngineering ,JapanInnovation ,DisasterPrevention ,FloodControl

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