The Rolex Deepsea reference 136660 is one of the most capable professional dive watches ever produced by Rolex. It features a robust 44mm Oyster case in Oystersteel, engineered with the exclusive Ringlock System — combining a nitrogen-alloyed steel compression ring, a thick 5.5mm domed sapphire crystal, and a titanium caseback — to achieve an extraordinary water resistance of 3,900 metres. Equipped with a unidirectional black Cerachrom bezel, helium escape valve, and Triplock crown, it is built for extreme saturation diving. Powered by the in-house Calibre 3235 automatic movement with approximately 70 hours of power reserve and Superlative Chronometer precision. Available with an intense black dial or the iconic D-Blue gradient dial (blue to black) inspired by James Cameron’s deep-sea expedition. Fitted with a solid Oyster bracelet featuring the Glidelock extension system for easy adjustment over a diving suit.