Extreme Engineering The Rolex Deepsea is built for the depths, developed in collaboration with professional divers and ocean explorers. Its robust construction and technical innovation make it one of the most capable dive watches in the Rolex catalogue. Ocean Proven This 2017 reference features a 44mm Oystersteel case with a rotatable black bezel calibrated for 60 minutes. The D-blue dial is powered by the calibre 3135 automatic movement with a 48-hour power reserve. The Oyster bracelet includes Fliplock, Oysterlock and Glidelock systems for secure wear in demanding underwater conditions.