He claimed his homes could be used as fallout shelters in case of nuclear wars and also claimed that, in the case of complete societal collapse, his design would be more defensible than a regular house in the case of random attacks, as well as being better concealed from potential hostiles (without a map and unfamiliar with the area). He believed that underground, inhabitants would be better protected from "atmospheric radiation" (sunlight?). Because his design was not waterproofed, one would be "closer to a source of water", and could potentially simply dig a well in the middle of the room.