Extreme Engineering The Rolex Deepsea is a professional dive watch built for the most demanding underwater environments. With its patented Ringlock system and exceptional waterproofness, it represents the pinnacle of Rolexs technical innovation in deep-sea exploration. Built for the Deep This 2019 reference 126660 features a 44mm Oystersteel case with a black dial and a rotatable 60-minute bezel. Powered by the calibre 3235 automatic movement, it offers a 48-hour power reserve. The Oyster bracelet includes fliplock, oysterlock and Rolex Glidelock systems for secure and adjustable wear during dives.