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Should a flood hit, Japan is ready.
要是洪災來了，日本就已經做好準備了。
And their solution is the largest underground water facility in the world.
他們的解決方案是世界上最大的地下水利設施。
About an hour outside of Tokyo is the Metropolitan Area Outer Underground Discharge Channel.
大都會地區外圍地下排水道距東京約一小時路程。
This tunnel sits 160 feet underground, and is around 4 miles in length.
該排水道位于地下約50米深處，長約6.5公里。
Inside is a network of large vertical shafts that store flood waters.
里面是一根根用于存儲洪水的大型立柱。
The giant tunnels were built because this area of Japan was constantly flooding.
之所以修建這一巨型隧道是因為日本這個地區洪災不斷。
Now, instead of inundating nearby towns,
如今，洪水不再會淹沒附近的城鎮，
the water flows underground and is diverted to a river that can handle the influx of water, making sure more than nine million residents stay dry.
而是流入地下，引入能夠容納大量水流的河流，確保900多萬居民不沾上洪水。
