Gallery: Check Out Tokyo’s Cavernous, Creepy, Totally Sci-Fi Drainage Tunnels
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Inside the water tank, also known as "the underground temple." It's full of nearly five-dozen 60-foot high pillars hewn from 500 tons of reinforced concrete.
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The flood defense system includes five silos, each one measuring 230 feet deep by nearly 100 feet wide.
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Massive yellow pumps suck water from the tank and dump it into the Edo River.
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Screens line the central control room.
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A map of the flood defense system.
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The pressure-regulating tank is the last stop for water passing through the system. It contains 59 reinforced concrete columns that help slow down the water and reinforce the ceiling.
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Bright yellow paint adds a touch of cheer to the dark underground facility.
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An employee at the underground storm drain.
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Each pillar in the pressure-regulating tank stands nearly 60 feet tall and weighs 500 tons.
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An opening between the pressure-regulating water tank and the first drainage silo.
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