The $50 & Up Underground House Book tells how to build the lowest-cost, best-ventilated, most sunshine-filled and driest underground houses of all. It teaches how to incorporate greenhouses, fallout shelters, and root cellars into an underground home. Covering both hillside and flat land design, it explains how to use dependable gravity to solve drainage problems rather than expensive failure-prone building materials. It also details ways to pass or otherwise deal with the building codes. This book explains in detail author Mike Oehler’s revolutionary Post/Shoring/Polyethylene (PSP) building method, which cuts building materials to the bone.