Extreme Performance The Rolex Deepsea is engineered for the most demanding underwater environments. As part of the Sea-Dweller family, it was developed in collaboration with professional divers and oceanographic institutions. With its patented Ringlock System, the Deepsea is capable of withstanding extreme depths while maintaining Rolexs signature precision and durability. Engineered for Depth This 2012 reference 116660 features a 44mm Oystersteel case and a unidirectional rotatable bezel with a 60-minute black Cerachrom insert. The black dial is protected by a domed sapphire crystal, while the Oyster bracelet includes both Fliplock and Glidelock extension systems for secure wear over a wetsuit. Powered by the calibre 3135 movement, it offers a 48-hour power reserveready for the deep.