resserus t1_j1auivd wrote
Reply to comment by reddit-admins-suck in Mars' ancient atmosphere may not have had much oxygen after all by pecika
Caves 20 miles deep on Mars would be at room temperature and sea level pressure. Underground everyone on Earth could live there.
GotGRR t1_j1b8qiq wrote
So, two or three times as deep, ten times the diameter of the deepest boring on earth and only a short 5 month space flight away? That sounds amazing and like a project for the second or third generation of settlers.
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