During the 1960s, the needs of professional marine divers working at great depths led to the development of the first 'ultra water resistant' tool watches designed for conducting safe diving operations at 300 m+ (1,000 ft+) depths.
The Rolex Oyster Perpetual Sea-Dweller Submariner 2000 (2000 ft = 610 m) that became available in 1967 was developed from the Submariner for the Comex S.A. industrial deep-sea diving company by increasing crystal thickness and was produced in several variations. It had a depth rating of 610 meters (2,000 ft) and its Rolex reference reference number was 1665.
The Sea-Dweller's integrated helium escape valve
Most Sea-Dweller watches incorporate a helium escape valve for saturation diving. Early Sea-Dwellers did not always have the helium escape valve. The model is also distinguished by the absence of the date magnifier ("cyclops") present on most other Rolex models. The Sea-Dweller diving watch range has been standard issue for Comex divers since 1977.
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