you are very right, whether or not you are in an overhead environment there are thing that can happen, for example you could become dissorientated (at 30 feet where your boyouncy is 0 you can lose which way is up, happend to me a few times. its better to have a partner then a passage strait up, as many freedivers drown on a sand flat bottom with a clear path up, all because they were alone.
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"Enzo: Hey, do you have any more complaints? Just make a list and we'll stick it on the porthole, OK!?"
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