Deep Dive Heritage The Rolex Sea-Dweller is a professional divers watch engineered for extreme depths. Originally developed in collaboration with saturation divers, it features a helium escape valve and robust constructionmaking it a trusted tool for underwater exploration. Modern Reference This 2017 reference features a 43mm Oystersteel case with a black dial and rotatable 60-minute bezel. The Oyster bracelet is equipped with a Fliplock Oysterlock clasp and Rolex Glidelock extension system for a secure fit over diving gear. Powered by the calibre 3235 automatic movement, it delivers a 70-hour power reserveoffering precision and durability beneath the surface.