Not sure what this has to do with springboard diving and perished gaskets.
Wouldn't water get past perished gaskets without all this swimming and springboard diving misinfo?
A Rolex watch is rated to the depth stated for that model plus a safety margin when serviced and tested by a RSC.
As for the 100m rating for Omega meaning it can just be submersed in water?
Well that may be for Omegas but not for Rolex watches.
So go swim, jump, dive and splash around to 300m down with your Submariners.
Post up some pix.