Encyclopedia
Subsoil
Subsoil is a part of the Earth's crust located below the soil layer, and in its absence - below the Earth's surface and the bottom of water bodies and watercourses, extending to depths accessible for geological study and development
Source: Law of Russia dated February 21, 1992 No. 2395-1 (as amended on December 6, 2011) "On Subsoil" (with amendments and additions coming into force on January 19, 2012)