Mastering the Abyss The Rolex Deepsea is engineered for extreme depths. Designed for saturation diving, it features a helium escape valve and the patented Ringlock System, enabling it to withstand the crushing pressures of the deep ocean. It is a feat of technical innovation and a symbol of Rolexs commitment to exploration. Blue Dial, Bold Engineering This 2017 Rolex Certified Pre-Owned Deepsea, reference 116660, features a 44mm Oystersteel case, a gradient blue-to-black dial and a rotatable 60-minute bezel. Powered by the calibre 3135 automatic movement, it offers a 48-hour power reserve. The Oyster bracelet includes a Fliplock Oysterlock clasp and Rolex Glidelock extension for secure wear over a wetsuit.