There's still plenty of earth we could be learning to survive on without going all the way to Mars. Why not build a self-sustaining colony in Antarctica or unde

There's still plenty of earth we could be learning to survive on without going all the way to Mars. Why not build a self-sustaining colony in Antarctica or under the ocean or something first? Or hell, just a biodome do-over. All of those places are still a hell of a lot more habitable than Mars and have much easier rescue options.