Apple Watch in pool
I went in the pool and now my watch turned off and won’t turn back on
Apple Watch Edition
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If this is the water lock, rotate the digital crown dial a half-dozen or so times, and quickly.
How to use Water Lock and eject water from your Apple Watch - Apple Support
If the Watch is entirely off and not the water lock, then the Watch is likely damaged.
About Apple Watch water resistance - Apple Support
A dunked Watch that has failed is headed for replacement. Try shaking out any water and using a dry breeze or dry air conditioning airflow, but I’d not be hopeful. Rice isn’t recommended.