Ultra-Resistant Engineering The Rolex Deepsea is a professional-grade dive watch built to meet the most exacting demands of underwater exploration. Waterproof to an extraordinary depth of 3, 900 metres, it features the patented Ringlock System, a helium escape valve, and a robust Oyster case architecture. A symbol of Rolexs enduring partnership with deep-sea pioneers, the Deepsea is a technical masterpiece designed for precision, reliability, and resilience in the harshest environments. First Generation Reference This 2010 example, reference 116660, is housed in a 44mm Oystersteel case and powered by the calibre 3135 automatic movement, offering a 48-hour power reserve. The Oyster bracelet is equipped with Fliplock, Oysterlock, and Rolex Glidelock extension systems for secure and adjustable wear. A foundational model in the Deepsea lineage.