Deep underground (Japanese law)

For construction 20 meters or more below ground using methods other than cut-and-cover, see deep level underground.

Deep underground (大深度地下, dai-shindo chika) 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.

However, due to technical difficulties in ventilation, emergency procedures and other safety-related issues and the relatively high cost, no projects using deep underground have been completed as of 2010.

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