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Are you sure that’s not a microphone for videos? It’d be really weird to have a hole like that. Water should easily push itself through that hole. I honestly don’t know what you’re talking about when it comes to air pressure. I’m pretty sure your eardrums can survive close to a 1 atmosphere difference in pressure, and those are way more fragile than your phone. I’m not sure why your phone would need to normalize air pressure.
Waow, that’s amazing! So cool, so exciting! We’ve never seen anyone try anything like this ever before!