Rolex
Rolex SA () is a Swiss luxury watchmaker. Originally founded as "Wilsdorf and Davis" by Hans Wilsdorf and Alfred Davis in London in 1905, the company registered "Rolex" as the brand name of its watches in 1908. In 1919, the company moved its base of operations to Geneva, Switzerland in order to avoid heavy taxation from a recovering post-war Britain, and "Montres Rolex S.A." was registered as the new company name by Hans Wilsdorf in Geneva in 1920. Since 1960, the company has been owned by the Hans Wilsdorf Foundation, a private family trust.
Rolex Sea Dweller
In late March 2012, Rolex announced that a new prototype diving watch was developed and is part of the Rolex supported attempt to dive the DSV "Deepsea Challenger" to the bottom of the Challenger Deep, the deepest surveyed point in the oceans.
On 26 March 2012 the DSV "Deepsea Challenger" carried a Rolex Oyster Perpetual Date Sea-Dweller DEEPSEA CHALLENGE prototype diving watch strapped to its manipulator arm to a depth of of seawater (msw).
The experimental Sea-Dweller DEEPSEA CHALLENGE watch is designed to be waterproof up to . According to the pilot of the DSV "Deepsea Challenger", James Cameron, the "Rolex Deepsea Challenge was the reliable companion throughout the dive; it was visible on the sub's manipulator arm and working precisely at 10,898 meters down at the bottom of the Challenger Deep."
The normal surface air filled watch case has a diameter of and a thickness of (domed synthetic sapphire crystal ) to cope with the water pressure at the deepest surveyed point in the oceans.