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Thanks for posting the link to the article...nice read and generates some ideas.
My sister purchased one of the first underground homes built in Oklahoma. It was encased in concrete like an open front box. It was cool in the summer and warm in winter. Problem was the builder put soil and sod on the top for a roof...as the original degins instructed. The home developed black mold and she got really sick. Gophers also dug into the seal around the steel beams in the roof line and the bedroom ceiling collapsed spilling dirt on the boys bed.....big mess. Insurance was realllllllyyy hard to get because there were few comprables at the time. And when she sold it...same problem. The buyer actually gutted the inside and cleared off the top, sealed it with some kind a rubber with a sloped roofline and used it for a garage for a newer traditional home built on site.
The one shown here is great...traditional roof, open front and windows for ventilation...a much better design.