Title: Darkest depths and other underground megastructures
Description: "Describes the technology and engineering used to build deep mines, to drill for oil, and to build deep underground tunnels"--Provided by publisher.
Subjects: Juvenile literature, Underground construction, Building, Building, juvenile literature, Miscellanea, Engineering, Technology, Tunnels, Constructions souterraines, Ouvrages pour la jeunesse, Conception et construction