-While I cannot take my PO diving for medical reasons (That is, my lungs are not up to it - the PO is just fine.. ), I have on occasion strapped it onto subsea equipment to see whether it holds up.Do you guys/girls actually use the watch to go diving?
The deepest it has gone was to its rated 600m somewhere off the Angolan coast - wound it fully before I strapped it onto the hook, kept it at 600m for approx. 40 hours before hoisting it back up again. When it resurfaced, it was ticking away happily as it had done when it was lowered - having lost about a second and a half, whereas it normally gains a little every day.
I put this down to the lower temperature - 40 hours at 4 degrees C or so.
As it was not a saturation dive, operating the He escape valve was not a concern, either.
But, as others have pointed out - if a watch can be taken to 600m and live to tell the tale, chances are it can take a beating onshore, as well. In my (uneducated) opinion, water resistance is a good indicator of overall ruggedness.