Darkest depths and other underground megastructures

By Ian Graham

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