I seen a TV program years ago about these Australian modern cave dwellers. The carved out their houses in this soft rock. It was amazing how beautiful and cozy it was. Beautifully sculptured dome ceilings. They would coat the surface with something to seal it. Some had indoor pools and Spas and sylights. The inhabitants seemed to love it and said they could expand their living space when the need arises.
My Popular Mechanics magazines would sometimes feature alternative housing. Some were covered in soil and claimed to have a temperate climate inside needing minimal heating and cooling..
Most people I think would prefer a traditional style above ground dwelling including myself, but heck, living in a modern cave could be a great way to live, and not just survive.
Now I love watching that tree house show, these are not rikidy barn board junkers with a rope ladder but full blown gorgeous houses. I have also seen shows where people have made their homes out of missle silos and boats and airplanes, really creative.
So maybe if we do have an economy meltdown, we can all get back to nature, haha
Rando