Conquering the Deep
Images: Courtesy of Rolex
Rolex recently introduced the new generation of its Oyster Perpetual Submariner and Oyster Perpetual Submariner Date, watches that exemplify the historic links between Rolex and the world of diving.
Rolex was one of the first brands to accompany exceptional individuals in their ventures and explorations. Aware of the mutual benefit to both parties and seeing the world as a living laboratory, Founder Hans Wilsdorf equipped them with Oyster watches on their expeditions.
At the beginning of the 20th century, the pocket watch was the most common and practical way for people to tell the time. Wilsdorf, who began his career in 1900 working for a watch company in La Chauxde-Fonds, observed how lifestyles were changing and particularly the rise in popularity of sports and outdoor pursuits. The man who was to found Rolex a few years later realised that pocket watches were not suited to these new kinds of use. A man of vision, he decided he would create watches to be worn on the wrist that their owners could count on for reliability and accuracy in their modern, active lives.
One of the main challenges facing Wilsdorf was to find a way to protect the watches from dust and moisture, which can cause clogging or oxidization if they find their way inside the case. In a letter in 1914, he spoke of his intentions to Aegler, the firm in Bienne which would later become the Manufacture des Montres Rolex S.A.: “We must find a way to create a waterproof wristwatch.”
In 1922, Rolex launched the Submarine, marking the first step in Wilsdorf’s efforts to create a completely sealed watch case that was convenient to use.
The Oyster case, the fruit of these efforts, was patented four years later in 1926. A system of screwing down the bezel, case back and winding crown against the middle case ensured that the case was hermetically sealed and protected the inside of the watch from harmful elements. Wilsdorf chose to call the watch – as well as its case – the “Oyster” because of the fact that “like an oyster, it can remain an unlimited time underwater without detriment to its parts.” This invention marked a major breakthrough in the history of watchmaking.
To promote the exceptional qualities of his Oyster watch, the following year Wilsdorf decided to do something innovative. Learning that Mercedes Gleitze, a young secretary from Brighton, England, was preparing to swim across the English Channel and, if successful, she would become the first British woman ever to achieve this feat, Wilsdorf asked her to carry an Oyster with her to demonstrate that the watch was completely waterproof. After Gleitze’s gruelling swim in the bitterly cold waters, a journalist for The Times newspaper reported that she “carried a small gold watch, which was found to have kept good time throughout.”
Just Below The Surface
Just as changing lifestyles prompted Rolex to invent a waterproof case, the brand next turned its attention to the design and development of wristwatches that met the needs of the new deep-sea diving professionals.
In 1953, the Submariner was created: the first divers’ wristwatch guaranteed waterproof to a depth of 100 metres (330 feet).
Rolex then went on to make further technical advances that rendered the Submariner waterproof to a depth of 200 metres (660 feet) in 1954, and 300 metres (1,000 feet) in 1989. The version with date, introduced in 1969, would be waterproof to a depth of 300 metres (1,000 feet) by 1979.
To test the reliability of its timepieces, Rolex asked professional divers to wear them on their missions, afterwards gathering impressions and suggestions for ergonomic or technical improvements. This procedure became an integral part of the Rolex development process. Among the people with whom the brand worked to test the Submariner was French underwater photographer, engineer and explorer Dimitri Rebikoff. In testing the watch, over five months Rebikoff carried out 132 dives, which took him to depths of between 12 and 60 metres. His report was very positive: “We are able to confirm that this watch has not only given entire satisfaction in diving conditions which were extremely tough and particularly dangerous for the material used, but it has also proved to be an indispensable accessory for all diving with independent equipment.”
Rebikoff particularly highlighted the usefulness of the graduated rotatable bezel, which considerably increases divers’ safety by enabling them to check the amount of time they spend underwater. He also underlined the robustness of the watch, which spent many hours in seawater and received several impacts in the course of the dives.
A Glimpse of The Deep
Certain sub-aquatic scientific projects and expeditions also presented ideal opportunities for Rolex to test its watches in real-life conditions. In 1960, the brand teamed up with one such project - an expedition led by Swiss oceanographer Jacques Piccard and U.S. Navy Lieutenant Don Walsh. On 23 January, on board the bathyscaphe Trieste – designed by Jacques’ father, Auguste Piccard, a Swiss physicist and explorer with whom Rolex had worked since the early 1950s – Piccard and Walsh achieved a feat by descending to the deepest part of the world’s oceans, the Mariana Trench in the Pacific Ocean. Affixed to the outside of the submersible was an experimental Rolex watch called the ‘Deep Sea Special’, which accompanied the two men to an extreme depth of 10,916 metres (35,814 feet). The domed crystal on this prototype was designed to withstand the enormous pressure exerted at such a depth. When the Trieste resurfaced after some eight and a half hours under the sea, the watch was found to have kept perfect time, which validated the technical choices made by the brand during its design. It would be decades before any such expedition would be repeated.
A Watch for Sea Dwellers
During the 1960s, techniques were developed that made extended dives possible at ever greater depths. One of these new methods, designed for divers working on undersea infrastructures, for example, was “saturation” diving. A special mix of breathing gases with a high helium content makes it possible for divers to stay under the sea for periods of several days or even weeks, and avoid the toxic effects on the human body of pressure at great depths. It also involves keeping the divers in an environment with a pressure equivalent to that of the water at their working depth. To do this, the divers stay for several days or weeks at a time in a pressurised habitat – a hyperbaric chamber – which they leave only to carry out their dives. It also means that they need only undergo a single decompression process at the very end of the mission. Depending on the time spent underwater and the working depth, decompression can take anywhere up to several days.
In the hyperbaric chambers, the watches worn by the divers gradually fill with helium, a gas with atoms so tiny that they can penetrate the waterproof seals. During decompression, this helium remains trapped in the watch case with the attendant risk of creating a pressure differential in relation to the chamber. The gas in the watch case is unable to escape as quickly as the external pressure is dropping, which can damage the watch or force the crystal out of the case. In 1967, Rolex patented the helium escape valve, a safety release valve that activates automatically when the pressure inside the case is too high, allowing the surplus gas to escape.
That same year, Rolex launched the Sea-Dweller, a divers’ watch guaranteed waterproof to 610 metres (2,000 feet), and to 1,220 metres (4,000 feet) in 1978.
Equipped with a helium escape valve, it was the ideal tool for saturation divers, the explorers and pioneers of the deep sea. As a natural progression, the brand partnered with the underwater habitat project Tektite in 1969 for which four aquanauts spent 58 days below the surface. They were equipped with Rolex watches.
The following year as part of Tektite II, Sylvia Earle led an all-female mission. The marine biologist – a Rolex Testimonee since 1982 and National Geographic Society Explorer-in-Residence from 1999 – wore a Rolex watch during the two weeks spent working in a sub-aquatic habitat.
In 1967, Rolex began a partnership with HYCO (International Hydrodynamics Company), a Canadian firm specialising in the development of submarines.
Rolex Sea-Dweller watches were attached to the outside of HYCO submersibles on various missions. After one dive of around four hours at a depth of 411 metres (1,350 feet), HYCO sent Rolex its conclusions regarding the Sea-Dweller’s performance: “During all the phases of testing the watch performed beautifully.”
In 1971, Rolex formalised its partnership with COMEX (Compagnie Maritime d’Expertises). This French marine engineering firm based in Marseilles agreed to equip its divers with Rolex watches and report back regularly on the watches’ performance so that the brand could further enhance their reliability and functionality. In parallel to its offshore interventions, COMEX also conducted tests in view of developing new technologies to assist its operations. Among these were hyperbaric chambers that reproduced the pressure exerted at depth and posed great difficulties for divers and equipment.
In 1988, COMEX organised the Hydra VIII expedition, during which six saturation divers descended to 534 metres (1,752 feet), setting a world depth record for open-sea diving that still stands today. All were equipped with Sea-Dweller watches. A few years later, in 1992, for the Hydra X experiment, a COMEX diver reached a simulated depth of 701 metres (2,300 feet) in a hyperbaric chamber. For the 43 days of his mission he also wore a Sea-Dweller watch.
The Deepest Depths
Rolex continues to defy underwater pressure by never ceasing to perfect its watches. In 2008, the brand presented the Rolex Deepsea, whose patented case architecture – the Ringlock system – enables it to withstand the pressure at a depth of 3,900 metres (12,800 feet). The system comprises a slightly domed sapphire crystal, a nitrogen-alloyed steel compression ring and a case back made from a titanium alloy. The unidirectional rotatable bezel of the Rolex Deepsea is fitted with a 60-minute graduated black Cerachrom insert that allows divers to safely monitor their immersion time. The properties of this high-tech ceramic produce an insert that is exceptionally strong, virtually scratchproof, and whose colour, unaffected by ultraviolet rays, remains stable over time. This watch for the extreme depths is also equipped with another exclusive invention that enhances its legibility: the Chromalight display. An innovative luminescent material emitting a blue glow is applied to the hands, hour markers and the capsule on the bezel. The luminosity duration is almost double that of a standard phosphorescent material, and the intensity of the glow is more consistent over the emission time.
In accordance with the standard for this type of watch, all Rolex divers’ watches are tested at their guaranteed waterproofness depth plus an additional 25 per cent. This effectively means that in the laboratory, within a hyperbaric tank developed jointly by Rolex and COMEX, the Rolex Deepsea (which is guaranteed waterproof to 3,900 metres) is subjected to the pressure exerted at 4,875 metres deep.
The Rolex Deepsea was the inspiration behind the Rolex Deepsea Challenge, the experimental divers’ watch that, on 26 March 2012, attached to a manipulator arm of the submersible piloted by explorer and filmmaker James Cameron, descended to the place last visited by Jacques Piccard and Don Walsh in 1960: the Mariana Trench. Guaranteed waterproof to the extreme depth of 12,000 metres (39,370 feet), the watch included all of the brand’s technical innovations in terms of waterproofness, and, in the test phases, successfully withstood the pressure exerted at 15,000 metres. At this depth, the Ringlock system’s central ring is subjected to a pressure equivalent to a weight of 20 tonnes.
A New Generation
In 2020, Rolex presented the new generation of its Oyster Perpetual Submariner and Oyster Perpetual Submariner Date. Both watches feature a redesigned, slightly larger case of 41 mm and a broader bracelet. The Submariner is equipped with calibre 3230, unveiled by the brand this year, and the Submariner Date incorporates calibre 3235, a movement that includes a date function in addition to the time and has been brought to the Submariner range for the first time.
True to the original aesthetics of the model, the new Submariner in Oystersteel has a black dial and black rotatable bezel with Cerachrom insert. A yellow Rolesor version (combining Oystersteel and 18 ct yellow gold) of the Submariner Date presents a royal blue dial with a rotatable bezel and a blue Cerachrom insert. Two versions of the Submariner Date, one in Oystersteel and the other in 18 ct white gold, bring distinctive colour combinations, with the dial and Cerachrom insert in different hues. The first watch blends a black dial with a green bezel, while the second offers a black dial and a blue bezel. The 60-minute graduated Cerachrom insert allows divers to confidently monitor their dive times.
The moulded, recessed graduations and numerals are coated with platinum or yellow gold via PVD (Physical Vapour Deposition), whilst the bezel’s knurled edge offers excellent grip, to comfortably set dive time even when wearing gloves.
Since being patented in 1926, the perfectly hermetic Oyster case continues to be emblematic of Rolex watches. Its components have undergone changes over time to further reinforce the watch’s waterproofness and to meet the needs of divers as diving materials and techniques developed, allowing them to descend to ever greater depths…