Wow:

For Sale By Owner – The Ultimate Secure Home:

Strategically located in the awesome San Juan mountains of Southwest Colorado, this patented steel-reinforced concrete earth home was built to withstand almost any natural or man-made disaster you can name. It is more secure, safe, and functional than any conventional house could ever be, yet still has a level of comfort that one might not expect to find in an underground home.

The list of features starts out reasonable, but the description of how it was built and why just kept getting more surreal…