Living underground makes sense for a lot of reasons. No cooling or heating is required, and if it does, not alot of energy would be needed. As far as ET being underground, well think of Mars. Mars already has dormant volcanic magma tubes which go deep enough to avoid the radiation exposure on its surface.

As far as here on Earth?

Well military defense bunkers such as Denver Airport exist. And their sole purpose is when the bombs start dropping, the people inside survive. So going underground makes sense.

I do think that as we poison the planet more and more over the coming years that this will be the only alternative.

I wonder - would it ever reach the point when our descendants would find it strange to live up top - guess they would feel very exposed!

Is this our future?

Is above ground where we would send our criminals?

As far as the concept of a select few living underground while the rest of us die topside...for whatever reason...Nuclear...Supervolcano....Asteroid or Comet strike....it is a fools quest.

You still need clean air....in all cases listed....so much debris....and a Asteroid strike of sufficient size and velocity could kick up alot of natural radioacive elements....and as far as the shere movement of the Earths crust from the two listed that are natural disasters....undrground reinforced caves would not stand a chance.

A Man Made disaster such as a Nuclear war would only allow people to live for so long underground. Modern day Thermonuclear Bombs...are not like the Fission style bombs dropped on Japan. The Earth would be unihabitable for thousands of years and I don't care how high tech an underground air filtration system is....radioactivity will eventually get in.

Plus...for whomever the poster was that said no A/C needed. It get's very hot as you tunnel deep underground. Even a few hundred feet will have an increase in temp. never mind the thousand foot plus depth you would need to survive....but it would be for a short time.

Split Infinity