deep underground
From Underfoot
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.
| Type | Subtype | Date | Description | Notes | Source |
|---|---|---|---|---|---|