When considering a subway station as a shelter, in general,
the subway runs near the surface in order of Ginza Line, Marunouchi Line, Hibiya Line, and Toei Asakusa Line and there is no stations deeper than 20 Meters.

On the other hand, there are many stations deeper than 20 meters from the surface of the ground on Oedo Line, so it is safe to flee to a station on the Oedo Line when a nuclear shelter is needed.

In Particular, Roppongi Station is close to -42M deep. There is a "depth from the ground,40 meters" is displayed.

It is thought that the station was deep because there was a Defense Agency before the construction of Tokyo Midtown.

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