Stepping back a few years for a moment to 1960, Rolex released the Deep Sea replica watches uk Special that was a non-commercial concept watch meant for extreme diving. It featured an extremely thick steel case and replica watches uk almost comical bulbous crystal given that it was going down near the bottom of the Mariana trench strapped to the Trieste bathyscaphe submersible. The production of replica watches uk the Deep Sea Special gave Rolex valuable knowledge about extreme water resistance and the watch successfully descended to 37,800 feet. The development of the Deep Sea Special allowed rolex replica sale to produce an even more durable version of the Submariner that they called the Sea-Dweller, which was originally released in 1967. It was water resistant to 630 meters, though later that number replica watches uk increased. In many ways the Sea-Dweller helped Rolex lead up to the modern Submariner and DeepSea timepieces of today.