Hello everyone
As stated in the watch specs (vivoactive 4):
Water Rating: 5 ATM
Withstands pressures equivalent to a depth of 50 meters
splashes, rain or snow, showering, swimming, diving into water, snorkeling
So in theory it could hande scuba diving / free diving at 10m - 20m
But it does not say for how long though. It's not the same being at -15m for 30min than 1 hour. Nor is the same to descend at kicking speed than slowly.
But have anyone done it?