Rolex has long been established as an innovator in technology as well as style, and the brand's Sea-Dweller line is the result of years of collaboration with experts in the field of deep sea diving. During the 1960s, as the needs of divers evolved, so-called 'ultra-resistant' watches began to be produced. Thanks to their greater crystal thickness, integrated helium escape valves, and thicker case, the Rolex Sea-Dweller models were water resistant at depths of 2,000 ft; twice the depth of most competitors. Thanks to close business relations with the COMEX deep sea diving company, the ground-breaking design has continued. Today, watches in the Sea-Dweller line are resistant at depths of up to 4,000 ft (1,220 metres) and retain all of the class and elegance you would associate with this luxury watch brand. Rolex Sea-Dweller is a highly sought after timepiece and status symbol. Indeed, its high-class design and engineering are sure to impress at even the most extravagant of events, while those keen on deep sea diving cannot fail to be impressed by its supreme functionality.