deep underground

Deep underground is a Japanese concept for the public use of deep underground, enabled by a 2001 law. It was first thought of in the late 1980s as Japan faced ever-increasing land values in the economic bubble, to allow the use of heretofore-unused deep underground for necessary water and utility ducts and other city tunnels.

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Wikidata
subterranea, Japan, 
subterranea, 

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Frameless

Type	Subtype	Date	Description	Notes	Source