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Did you know?
Underneath Tokyo, there are five enormous cylindrical shafts that fill with water during floods to protect the city from flood damage. This system, known as the G-Cans Project, prevents extensive flood damage.
![Picture Tokyo’s Giant Underground Shafts Protect City from Floods](https://unbelievable-facts.com/wp-content/uploads/2024/05/G-Cans-Japan-450x300-c-default.webp)
Manuel Ascanio/shutterstock.com
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