In the 1960s, so-called “saturation” diving made it possible to remain at great depths for extended periods. It consists of housing divers in a pressurized habitat, so as to reproduce the pressure that prevails in their underwater working environment. This means that they need only undergo a single decompression process, at the very end of the mission. This process can damage the watch. Divers breathe a mix of gases composed mainly of helium, whose extremely fine atoms can penetrate the case. On returning to the surface, the helium trapped inside can create a phenomenon of excess internal pressure liable to compromise its integrity.

The Chromalight display, exclusive to Rolex, gives the Sea-Dweller optimal legibility in any circumstances. The hour markers, hands, capsule and bezel are filled or covered by hand with a luminescent material that emits an intense blue glow in the dark that lasts up to two times longer than traditional phosphorescent materials.

Explorers and oceanographers, like Sylvia Earle, and underwater photographers, such as David Doubilet, are committed to preserving the ocean and know that it is our most precious resource. They wear a Sea-Dweller to reflect their passion and commitment. Rolex has also partnered with Comex (Compagnie Maritime d’Expertises) since 1971. For several decades, the Sea-Dweller has equipped the divers of this French company, which specializes in underwater engineering, technology and intervention.