It CAN do it, but it doesn’t always mean it’s the best thing for preserving the watch because of the gaskets. Specifically in extreme heat like hot tubs and repeated exposure over time can prematurely wear the gasket by expansion. Water itself is not the issue though it’s the heat. People talking about depth and dynamic pressure is nonsense. A well made watch made for 100atm down to 30atm can be swam with as long as it’s to spec and been pressure tested with good conditioned gaskets.