Rolex Sea-Dweller 4000ft 16600 Discontinued 2005 [Preowned]Overview The Sea Dweller is part of the Rolex Professional watches specializing in diving. It was initially introduced in the 1960s as a specialty watch to dive deeper than the Submariner. These watches were designed to be for the hardcore divers in mind with missions or purposes for deep dives, unlike the Submariner. The Sea Dweller range has been around for 50 years and pre dates the origins of the Deep Sea Dweller which was only introduced in 2008.