Deep-Sea Heritage The Sea-Dweller is a professional-grade dive watch engineered for extreme underwater conditions. Developed in collaboration with deep-sea explorers, it features a helium escape valve and robust construction. With its larger case size and enhanced legibility, the Sea-Dweller is built to perform at great depths while maintaining Rolexs signature aesthetic. Engineered for Depth This 43mm Rolex Sea-Dweller, reference 126600, features a black dial with Chromalight display and a unidirectional rotatable bezel with a 60-minute Cerachrom insert. Crafted from Oystersteel, it houses the calibre 3235 automatic movement with a 70-hour power reserve. The Oyster bracelet includes both Fliplock and Rolex Glidelock extension systems for a secure fit over dive suits.