The Rolex Sea-Dweller Deepsea reference 116660, launched in 2008, is a diving watch in a 44 mm Oystersteel case rated water resistant to 3,900 metres (12,800 feet). It has a Cerachrom ceramic bezel, a sapphire crystal about 5.5 mm thick, a helium escape valve and the Ringlock case system that Rolex used to resist the pressure. It runs the automatic calibre 3135.

The Deepsea was an upgrade of the Sea-Dweller line with a far larger case, and was created from the technology Rolex developed for the experimental Deepsea Special of 1960. A blue-to-black “D-Blue” dial was added in 2014 as a tribute to James Cameron’s dive to the Mariana Trench.

The community’s views are split: some admire its engineering and presence, others find the 44 mm case too large and thick for everyday wear. The 116660 was replaced by the 126660 around 2017 and is no longer in production, although the Deepsea collection continues.