Mens Rolex Sea-Dweller 4000 watch, stainless steel case (40mm diameter) with specially designed helium escape valve, special time-lapse rotatable bezel with black insert, stainless steel Oysterlock bracelet with wetsuit extension link, black dial with luminous hour markers, date calendar, 31 jewel self-winding Oyster Perpetual chronometer movement, special Oyster case with shoulders to protect the triplock winding crown, synthetic sapphire crystal, pressure-proof to 1220 meters (4000 feet).
During deep dives lasting several days, the helium molecules spread throughout all the matter and penetrate the watch in sufficient quantity to push out the sapphire crystal at atmospheric pressure levels. The helium escape valve of the Rolex Sea-Dweller prevents this from happening. The valve is used by divers to release helium from their watch while they rise up to the water's surface.
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