What impedes us from creating habitable spaces in mountains/deep in the earth/underwater; and could it ever be viable in our lifetimes?

Question

Do you ever look at irregular spaces and think man it would be nice to have a home here? That’s the basis of this question!

In: Engineering

Answer 1

It takes a lot more work to remove something then build something else where the first thing was. It also difficult or even impossible to put the something that was removed back if you make a mistake or change your plans later.