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According to a video by HGTV, the couple spent 15 years working on the project. They sold it in 2018 to its current owner for $987,000. It's now back on the market for $998,500.
The 37-acre property, which is filled with plants, trees, and natural pools, includes a two-level guest house and a small studio in addition to the cave house.
Additional areas like the kitchen and dining room were added blast by blast off to the sides of the hallway. Each blast gave the couple around "10 feet in,10 feet up, and 10 feet wide," according to the video.