From brilliant blue to bottomless black, the Rolex Deepsea D-Blue Dial’s two-color gradient dial celebrates James Cameron’s historic solo dive to the deepest place on Earth: the bottom of the Mariana trench. The innovative Chromalight display on the dial pushes the boundaries of visibility in dark environments; its distinctive blue glow lasts up to twice as long as that of standard luminescent materials. The zero marker on the bezel, in the form of a triangle, is also visible in the dark reaches of the ocean thanks to a capsule containing the same luminescent material. The Rolex Deepsea owes its exceptional strength, waterproofness and pressure resistance to the exclusive Ringlock system. This innovative case architecture patented by Rolex enables the watch to resist the massive pressure exerted by water at the depth of 3,900 meters (12,800 feet). Its construction is based on three elements: a nitrogen-alloyed steel central ring forms the backbone of the system, accompanied by a 5 mm‑thick, domed sapphire crystal, and a case back in grade 5 titanium.
The watch also features the brand’s Helium Escape Valve. This safety valve acts as a miniature decompression chamber for the watch and is essential for deep saturation diving. Professional divers heading for the surface after a deep saturation dive must spend time in a decompression chamber, where they breathe a gas mixture containing helium. The tiny molecules of helium infiltrate everywhere in the chamber, also penetrating the watch. During decompression, the helium is unable to escape from the waterproof case quickly enough, creating a pressure differential that could force the crystal out of the watch case. Rolex engineers created a gas escape valve fitted with a spring: it opens when the difference in pressure between the inside and outside of the watch reaches 3 to 5 bars, allowing the helium to escape, without compromising the waterproofness of the watch. For more information please visit Rolex’s official website.