Underearth-..

"Underearth" is the story of two young boys in a small western American town who accidentally stumble upon an ancient underground world entirely inhabited by children and teenagers. The two boys marvel at the ingenious ways these children have survived over the years and the unique world of dens, caverns, and tunnels they carved beneath the surface of the earth. Their remarkable discovery might lead them to great fame and fortune, but their fate might also be jeopardized by the teenagers in power and a second mystery that the boys have inadvertently unraveled.