Deep Dive Icon The Rolex Sea-Dweller is built for saturation diving, with a helium escape valve and robust construction that withstands extreme underwater pressure. Its a professional-grade timepiece that reflects Rolexs pioneering spirit in deep-sea exploration. Classic Aesthetics This 2018 reference features a 43mm case and is powered by the calibre 3235 automatic movement, offering a 70-hour power reserve. The Oyster bracelet includes Fliplock and Glidelock systems for secure fit over diving gear. A rotatable bezel with 60-minute scale ensures precise dive timing.