[teleforce]

>anonymous private investor, has begun work to create a ‘permanent human settlement’ under the sea

This sound so preposterous as work to create ‘permanent human settlement’ in Mars.

But if given a choice which one to support with my money with zero probability of any returns, I will much rather supporting sea settlement than Mars.

[delichon]

Do you have so little faith in humans' capacity to make Earth uninhabitable? There's no value to you in putting a few eggs in another basket?

[xnx]

How would humans make Earth less habitable than Mars?

[ryandvm]

Exactly. Maybe we'll muck up the climate here a bit and have to spend some resources to get it back on track, but Earth will never be less hospitable than Mars.

And we are probably hundreds of years away from being able to have a self-sufficient colony on Mars.

The only reason to attempt to settle Mars is because it represents the fattest international government contract that has ever existed - and I suspect that has always been the primary motivation for the Mars hucksters.