The G-Cans project is an underground infrastructure in Tokyo, Japan built for preventing overflow of the city's major waterways and rivers during rain and typhoon seasons.
Work on the project started in 1992; it consists of five concrete containment silos with a height of 65 m and a diameter of 32 m, connected by 64 km of tunnels, 50 m beneath the surface, as well as a number of 14,000 horsepower (10 MW) turbines that can pump up to 200 tons of water into the Edogawa river per second.
The G-Cans project is also a touristic attraction and can be visited for free.
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