Re: Cameron's attempt to cram a robot arm wearing a Rolex into his pristine bottom
Water resistant ratings like 200m are static pressures. If you move a watch around in water or hit/splash it with water (shower, hand washing, etc.) then you will need a higher water resistance rating than you might expect.
As a though experiment, if you train a fire hose on a watch, it will need to be pretty damn water resistant even though it's still above ground...