The Rolex Sea-Dweller Deepsea has a water-resistance level of 3,900 meters (nearly 13,000 feet), and it is more than 10 percent slimmer than it otherwise would have been thanks to a special case construction developed by Rolex. It consists of three pressure-absorbing elements: a 5.5 mm thick sapphire crystal, a 3.28-mm-thick caseback made of grade 5 titanium, and an inner ring (on which both of them rest) made of Biodur-108 steel. Last summer, Rolex launched the new Rolex Deepsea D-Blue Edition (pictured below), with a proprietary “D-Blue” dial that is dark blue at the top, and then darkens gradually to black at the bottom. More details and photos here.
(Last Updated On: December 7, 2016)