Replica Rolex Lady-Datejust

Replica Rolex Lady-Datejust

COMEX divers not only needed solutions for water resistance at extreme depth, they also faced the danger of explosive decompression caused by helium penetrating the interior of the watch (divers breathed the mixture of oxygen and helium within their hyperbaric chamber after lengthy deep sea dives). To maintain a pressure identical to that underwater, the mixture in the hyperbaric chambers remained the same during the different phases of work and rest periods. This system was designed to eliminate the need to depressurize the chamber after each phase of work. Replica Rolex Milgauss.orecchini bulgari falsi
Before returning to free air, and depending on the depth attained, a period of depressurization was necessary to equalize the internal and external tension of the human organism. Though the process of depressurization is slow, the gas that accumulated inside the watch, having no means to escape fast enough, exploded the crystal off the watch, thereby risking injury to those inside the chamber and severely damaging an expensive watch.
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Rolex collaborated with COMEX to develop a solution by installing a one-way pressure escape valve on the side of the watch case, at the nine o’clock position. The one-way valve will begin to equalize the pressure inside the watch when the difference between the exterior and interior of the watch exceeded 2.5 kg. per sq. cm.
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The Helium Gas Escape Valve (HEV) was featured and tested on the Single Red and Double Red Patent Pending Submariner Sea-Dwellers, circa 1967-1969. Once the testing was successfully completed and Patent of the HEV approved, COMEX placed a special order with Rolex for the supply of a number of dive watches featuring the HEV and case with either ref. 5513 or 5514. This would be delivered to COMEX only and not provided for general sale.orecchini bulgari foto
The development and delivery of this unique reference evolved from a modified ref. 5513 to the final ref. 5514 with big case back numbers, circa 1975.