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It is one of the largest civil engineering projects in the world, but it is all hidden underground. It is known as Tokyo G-CANS drainage system, and it is gigantic. These photos are a good introduction:
Tokyo’s “Underground Temple” – The Largest in the World
The goal is to provide drainage for the city during typhoon season. The “temple” is an underground chamber with a capacity of about 350,000 cubic meters (roughly 92 million gallons of water). The water pumps out of this holding tank to the Edogawa river.
To get a better idea of the scale of this project, these videos help:
The audio track may not be helpful, but the video is impressive:
You can actually take a tour of G-CANS if you are in Tokyo and see it for yourself:
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