Since a watch retaining full structural integrity is in essence a pressure vessel, I would hope that NO force is being exerted upon the air inside the case (at depth)
But thank you for your voluminous reply You are the reason I have this DSSDv5 on my wrist as we speak. And btw, I have an appt with Zig to have it modded and serviced.
Thinking about this, it seems a simple solution to seat the DSSD caseback would be to build a jig out of Delrin to safely support the case from the front as you set the piece in an arbor press ... and squuuuish the caseback with the press ... and then tighten the screwback down until it seats. Or am I misunderstanding about which part is not seating.
Oh and the reason I am asking these pointed questions is that my cousins (identical twins) were USN rescue divers during their service and still dive every chance they get, owning their own gear. When they saw my DSSD this past weekend, their eyes bugged out and their FIRST QUESTION after I told them it was a rep was "Is it depth rated?" .. haha so now I can provide an answer.