The Metropolitan Area Outer Underground Discharge Channel, also known as the G-Cans Project or the “Underground Temple,” is a subterranean infrastructure that protects Tokyo against floodwaters during rain and typhoon seasons.

The massive structure consists of concrete silos, water tanks and pillars connected to a number of pumps that pump up to 200 tons of water into the Edogawa River per second. Ringer Peter dropped us a line about how one of the enormous collection chambers is also eerily like Moria’s many-pillared Second Hall.

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