Not watches, shoes. 
hackaday.com/2019/06/04/waterproofing-the-best-watch-ever-made/
Disassemble the watch and reassemble it submerged in mineral oil and it's waterproof to 700 meters/1200PSI.
edit:
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
Last edited by freebeard; 05-02-2023 at 04:40 PM..
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