Survive the coming apocalypse inside a big pipe buried underground / Boing Boing
"Atlas Survival Shelters sells huge corrugated pipe shelters outfitted for living with air filtration systems, Co2 scrubbers, and power generators. A 10' x 20' shelter goes for $30-$40,000 and the "Hillside Retreat," a 10' x 51', runs as high as $109,000. Options include a big screen TV, electric fireplace, oak flooring, hatch camouflaged as a boulder, and many other fine amenities."
As long as nobody figures out that the boulder is a hatch, you are on easy street.