Under the sea....

[Duane Peters]

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Pressure Hull: This is the biggy. Even in the vacuum of space you're only talking the difference between 0 and 1 atmosphere of pressure. That is miniscule compared to the structure needed for working at any noticeable depth. Rule of thumb is that ocean pressure goes up by 1 atmosphere every 33 feet, so by the time you hit any serious depth you're talking about literally hundreds of times the pressure differential. Most submarines and such that go down that low have to use increased atmospheric pressure on the inside in order to help compensate and reinforce the external structure.

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This is the point where the Larry Niven Fen are going to try to introduce the General Products hulls, I'm sure...