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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 16
06-06-2012, 10:34 AM
Under Earth gravity, every 33 ft you descend you are subjected to an additional 1 atmosphere of pressure. This should prevent any spaceship from descending underwater to any significant depth, unless they are built with massively over-engineered hulls.

Even submarines with 6-inch pressure hulls and reinforcing ribs every foot or so rarely can operate below about 1000 ft.