The Rolex Deepsea 116660 is a professional diver's watch that is designed for the deepest depths of the ocean. It is water-resistant to 3900 meters, making it the most water-resistant watch in the Rolex lineup. The Deepsea 116660 features a 44mm stainless steel case with a ceramic bezel, a deep blue dial and a screw-down crown. It is powered by an automatic movement and is equipped with a helium escape valve.