Salt water in apple watch
I went snorkeling in my Apple Watch and now it’s acting up, unable to unlock. It worked for a while last night but is not unlocking now. When it was working I used the water out function.
If you have Apple Watch Ultra or later, you can wear it during recreational scuba diving up to 130 feet (40 meters) and other activities like swimming, showering, and water skiing.
Apple Watch Series 2 and later can be used for shallow-water activities like swimming in a pool or ocean, but you shouldn't use models other than Apple Watch Ultra or later for diving, water skiing, or other activities involving submersion below shallow depth or high-velocity water.
For more info, see the 'Can I go scuba diving, swimming, or take a shower with my Apple Watch?' section in:
About Apple Watch water resistance - Apple Support
