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Rolex introduced the Oyster Perpetual Sea-Dweller in 1967 to address the rigorous demands of prolonged underwater missions. Enhanced through a close collaboration with Comex (Compagnie Maritime d'Expertises) professionals, the Sea-Dweller now boasts an impressive water resistance of up to 1,220 meters (4,000 feet). Engineered specifically for saturation diving, it features a helium escape valve that enables it to withstand the decompression phase during ascent, ensuring safe and reliable performance during the final stages of deep-sea exploration. The Sea-Dweller is a testament to Rolex's dedication to creating professional-grade timepieces for the most challenging underwater environments.