setting up a self sustaining city underwater does not keep the species from going extinct like setting up a self sustaining city in space or on another planet would.
the ultimate payoff is huge.
we are one asteroid strike away from extinction so it's kind of a having all your eggs in one basket concept.
Riverwolf007
True, but like I said it could be practice then in another 100 years or so we could actually go into space. Hoping, that we won't get hit by an asteroid for a few million more years.
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