Yes, they can pass gas at 33 feet below. why not?
No problem as long as the pressure released is greater than the pressure around you... Been there done that ...but make sure no snorkeller is catching the bubble with a funnel to stay down with you..hehehe
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Yes, for the most part, your whole body equalizes to the pressure/depth you're at. In the case of your intestines, water pressure is pressing on your belly as well as your rectum, so farting should not be a problem.