What happens if my Apple Watch is under water for more than 30 minutes?
What happens if my Apple Watch is under water for more than 30 minutes
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Nobody can answer that.
Lots of factors. Varies by Apple Watch series (5, here), how deep, how much pressure, what impurities in the water, etc. Swimming motions can generate higher pressures than might depth alone, too.
Official answer: About Apple Watch water resistance - Apple Support