The Sea-Dweller and Rolex Deepsea are ultra-resistant divers’ watches engineered by Rolex for deep-sea exploration. Waterproof to a depth of 4,000 feet (1,220 metres) for the Rolex Sea-Dweller, launched in 1967, and 12,800 feet (3,900 metres) for the Rolex Deepsea unveiled in 2008, they are the ultimate manifestation of Rolex’s leadership in divers’watches and the result of decades of collaboration with diving professionals. In 2014 Rolex released a special version of the model, the Rolex Deepsea with a D-blue dial, to commemorate James Cameron’s historic solo dive to the bottom of the Mariana Trench, some 11,000 metres deep. From twilight blue to bottomless black, its two-colour gradient dial celebrates one man’s journey to the deepest place on Earth.