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The case of the Rolex Deepsea is equipped with a helium escape valve that protects the diver’s watch from damage during deep diving, and Rolex patented the helium escape valve in 1967. When the diver is decompressed in a hyperbaric chamber, the helium escape valve releases the extra pressure that has built up inside the case. When it comes to deep diving, the reliability and safety of your watch are a top priority. That’s why every Rolex Deepsea undergoes Rolex‘s strict waterproof tests. For this reason, Rolex has teamed up with Comex, the famous French company specializing in underwater engineering and high-pressure technology, to create a high-pressure testing chamber. Each Rolex Deepsea is water-resistant to a depth of 3,900 meters, with an extra 25% safety margin added.

The Rolex Deepsea is equipped with a unidirectional rotating bezel with a black Cerachrom 60-minute graduated insert, allowing divers to stay on the seafloor and decompress safely. Made from very hard and corrosion-resistant ceramic, the patented Rolex bezel insert is scratch-resistant and does not fade even when exposed to sunlight. The numbers and markings engraved on the ceramic bezel are coated with platinum using PVD (Physical Vapour Deposition) coating technology. The outer ring teeth allow the outer ring to rotate and help the diver set the dive time, even with gloves.

The unidirectional rotatable bezel of the Oyster Perpetual Rolex Deepsea is made from very hard and corrosion-resistant ceramic that is not easy to scratch and does not fade even when exposed to sunlight. Die-cast numbers and markings are coated with platinum using PVD physical vapor deposition technology to help divers set their dive times.