Case architecture and waterproofness
A watch developed for extreme depths, guaranteed waterproof to 3,900 metres (12,800 feet), the Sea-Dweller Deepsea required the design of a case with a unique architecture, the Ringlock System. This innovation patented by Rolex consists of a combination of three distinctive features:
- The high-performance ring
Set inside the middle case of the watch between the crystal and the case back, the high-performance nitrogen-alloyed stainless steel ring withstands the pressure exerted by water on the crystal and the case back.
The middle case is made from 904L steel.
- The sapphire crystal
To resist pressure, the synthetic sapphire crystal is slightly domed and substantially thicker than the crystals of other Oyster models.
- The case back
The case back is made of a titanium alloy, an extremely resistant stainless material. It is held in place against the high-performance ring by means of a 904L-steel ring.
The helium valve
is made of high-performance stainless steel. Its size is adapted to the dimensions of the case to achieve optimal waterproofness. The helium valve is a safety feature which, during the decompression phase, releases the gases that infiltrate into the watch during caisson dives.
Indeed, between dives at great depths, professional divers use pressurised caissons in which they breathe high-pressure gas mixtures, notably containing helium, a very volatile gas that penetrates into the watch. As the diver resurfaces, the helium valve prevents damage to the watch.
The Triplock winding crown,
equipped with three seals and screwed onto the case, completes this ingenious waterproof system.
Display and legibilityThe bezel
The Sea-Dweller Deepsea
is equipped with a unidirectional rotatable bezel with a 60-minute graduated black Cerachrom
disc that allows the diver to precisely track his dive time.
Engraved in the Cerachrom,
the numerals and the graduations are filled with platinum through the use of a PVD technique patented by Rolex.
The zero marker of the graduated bezel, represented by a triangle, is visible longer at night or in the depths of the ocean thanks to a capsule containing a new luminescent material that emits a blue glow.The dial
To enhance legibility, the gold indexes and hands are wider and partially coated with the
same new luminescent material and also emit a blue colour. The movement
The Sea-Dweller Deepsea
is equipped with calibre 3135, known for its chronometric precision, its reliability and its robustness; it also features a Parachrom
hairspring with high resistance to shocks and magnetic fields.
Certified as a chronometer by the Swiss Official Chronometer Testing Institute (COSC), the movement has a 48-hour power reserve. The bracelet
Manufactured from solid 904L steel, the Sea-Dweller Deepsea
bracelet can be adjusted for wear over a diving suit up to 7 mm thick thanks to a double extension system:
A series of rigorous tests
- Fliplock extension links,
- the new Glidelock clasp, allowing fine adjustments.
Because deep-sea diving requires absolute reliability and safety, each Sea-Dweller Deepsea
must pass Rolex’s rigorous waterproofness tests. To this end, special equipment has been developed with the help of COMEX
(Compagnie Maritime d’Expertise), a world-renowned French company specialising in underwater engineering and hyperbaric technologies.