We know of nothing anywhere which comes even close to matching the wealth of knowledge found in this three-tape, six-hour DVD set. The design course taught in tape two alone is worth, we believe, a hundred times the cost of the set in the increased light, air and views it will afford your subterranean home, and in the home’s resale value. If you are just beginning to explore the option of underground housing, The $50 & Up Underground House Book alone will suffice. But if you are convinced you want to build below surface, or need more information to make up your mind, you need this set. It is valuable to owner/builders, self-designers, architects and contractors alike.