Two international experts on underground space design describe a pragmatic approach to using subterranean space for transportation, housing, shopping, delivery, and social/cultural activities. The authors' concepts provide a viable means to preserving land, reducing sprawl, and dealing with stressful climates. They also discuss challenges such as legal rights to underground space and the economic, social, behavioral, and psychological implications of designing and using this space. Includes case studies of Japanese, Canadian, and European utilization of underground space.