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: Whereas pressure differences between the
: surface and below the surface of a body of
: water will vary with the depth of immersion,
: and can be much more dramatic.
Right... BUT we're not talking about the watch being strapped to the OUTSIDE of a diving bell. It is INSIDE the bell on a person's wrist. The inside pressures in the bell are still within the human-tolerable range. So the watch is never exposed to the crushing pressures outside -- unless the diving bell bursts, killing the person before they have time to notice what happens to their watch.
This is the most common point of confusion with diving watches! In any diving over 75 meters, the human and the watch are INSIDE a pressure controlled chamber. The watch is NOT touching water, but is instead dealing with AIR pressue issues in the human-tolerable environment in the controlled chamber.
It is only a diving at depth of less than 75 meters that the person is wearing a diving suit with the watch on the outide, exposed directly to the external water pressure.
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