Engineered for Extremes The Rolex Deepsea is a professional divers watch built to withstand the most demanding underwater environments. Developed in collaboration with deep-sea explorers, it combines cutting-edge engineering with Rolexs signature aesthetic to deliver exceptional performance at extreme depths. Robust and Reliable This 2011 model features a 44mm Oystersteel case with a unidirectional rotatable bezel and black Cerachrom insert. Driven by the calibre 3135 automatic movement, it offers a 48-hour power reserve and is equipped with a Fliplock Oysterlock clasp and Rolex Glidelock extension system. A formidable tool watch designed for the deep.