With its IPX7 rating the Apple Watch should be able to survive a splash or two, but it’s supposedly far from fully waterproof. The manual specifically warns against submerging it for long periods, swimming with it or exposing it to high-velocity water.

So of course that’s exactly what someone did. DC Rainmaker put it through three gruelling tests, pushing it well beyond the limits set out by Apple.

First he took it for a 1,200 metre swim, which it survived. The heart rate measurements were inaccurate while it was submerged but everything seemingly worked fine once he got back to dry land.

Then he put it through two 5 metre dives and a 10 metre one and the watch came out of all three apparently unscathed.
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https://www.techradar.com/news/wearables/the-apple-watch-is-much-more-waterproof-than-we-expected-1293475