The following video illustrates the self adjusting mechanism in the clasp of the newly launched Tudor Pelagos 500 m diver in titanium, essentially a pair of springs that allow the clasp to expand and contract as the wearer descends and ascends in the water. The change in pressure due to the changing depth causes the neoprene wetsuit to expand and contract, so the bracelet will adjust to ensure a snug fit always. A very clever mechanism.
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