Deep underwater colonisation may be harder to accomplish: > Outer space has -15 psi, extreme temperature swings, and occasional micrometeorite impacts. Five mi

Deep underwater colonisation may be harder to accomplish: > Outer space has -15 psi, extreme temperature swings, and occasional micrometeorite impacts. Five miles subsea has, let's see, 11,800 psi... (http://www.quora.com/International-Space-Station/Given-the-actual-space-station-ISS-would-it-be-cheaper-to-build-the-equivalent-at-3-4-5-miles-deep-underwater-Why/answer/Ryan-Carlyle http://www.quora.com/International-Space-Station/Given-the-a...)