During the late 1960s, commercial work in the oceans and seas created professional diving organizations that needed tool watches designed for conducting safe diving operations at greater depths – known as saturation diving.
This led to the development of the first ‘ultra water resistant’ watches. In collaboration with COMEX - a France-based professional dive company which is considered as the NASA of the sea - Rolex developed its “Submariner” model to meet the most stringent technical and professional demands of the professional deep-sea diver.
rolex.watchprosite.com