Darkest depths and other underground megastructures

By Ian Graham

Subjects: Juvenile literature, Tunnels, Building, juvenile literature, Constructions souterraines, Building, Ouvrages pour la jeunesse, Miscellanea, Underground construction, Technology, Engineering, Conception et construction

Description: "Describes the technology and engineering used to build deep mines, to drill for oil, and to build deep underground tunnels"--Provided by publisher.