never put a clock rep in water without first at least tested. Why do I say this? Because most of the time the cap is not properly closed.
How do I know this?
This is my stock SD BP immersed in one meter of water for 5 minutes. He worked perfectly, there was only a bit of condensation under the glass.
But in the evening he was dead, and this was the result when I opened it LOL
So.... DON'T TRY THIS AT HOME! LOL ha ha ha
However, I noticed that the last rep of high quality (such as the sub V6S) seem to have already greased the seals of crown and tube, but it is always better before use in in pool or sea to put the silicone grease on all gaskets then close well the caseback and then have it tested from local watchsmith