[tftjfjtft]

Please, these things are not mechanical watches, which have been able accompany divers for literally centuries.

Speakers are trivially sealed, as are buttons. They are just a fancy electromagnet, or piezoelectric crystal.

Also both can work through induction potentially keeping them outside a "pressure chamber" and forgoing sealing altogether. Although I just want the steam of my shower not to mess up with my phone, not dive 100 m with it.