Except water resistance doesn't work that way. The "depth" ratings are a convenience for understanding, they're really a rough translation of pressure ratings, which are the important thing. The "meter" ratings mean the watch can withstand water pressure equivalent to it sitting motionless in still water at that depth. As soon as you start moving it around under water, so the watch is being pushed through the water (like, say, moving your arms while swimming), the water pressure on it goes way up.Really? 50 meters..164'......That's beyond the depth of most scuba divers.
Dive into a 10ft deep pool? It's subjected to water pressure much higher than "10 feet deep". Fall off water skis? The watch can momentarily get subjected to tremendous water pressure without ever going more than a couple feet below the surface. It's the same thing that makes a "belly flop" into a pool hurt so much, even if you're only going one or two meters deep.
So, yeah, "50 meter water resistance" is generally good for swimming. For scuba diving, I think they generally look for at least "200 meter water resistance" (and, more importantly, for real diving watches, they pressure test every single watch, not just one out of each production lot, or a single one at the beginning of production). The "meter" ratings are easy marketing terms, the real pressure ratings are given in atmospheres or bars.
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