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@Rasp @desea
So subs are pressurized like that for the same reason planes are. It's simulating normal pressure environment for them.
When you're diving, you gradually adjust inner pressure to match outer pressure, at least until your body can't compensate. Diving suits are a pocket version of what subs do.
When you adjust too quickly, throws shit outta whack. Ya get the bends, because your body tries to absorb more air in a fucked up way (I think).