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I remember the Rotary watch I had a decade ago taught me all that in the book. Apparently you shouldn't even splash about in the pool with a watch that can't handle at least 10 atmospheres. Definitely never watersports. It's never the depth, it's the pressure it hits the surface. I found a chart but lost it, there was an essay saying how the velocity/gravity etc affects the effective atm pressure.
pdlouche
Fair point. I don't dive either, well not often but I do surf regularly and I find the only watches that survive are properly ISO rated divers of 200m or more. Maybe peak pressures spike and water finds a way in if there's any weakness. Something to bear in mind if waterskiing or even diving is a likely holiday activity.