Mighty Machines - Season 02 Episode 05 - Deep Underground

by Unknown 05:48 0 yorum Deep Deep Underground mighty machines bus mighty machines fire trucks mighty machines recycling mighty machines tow mighty machines trains mighty machines trucks 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 utilization 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 also relatively high cost, no projects utilizing deep underground have been completed as of 2010.