The Rolex Oyster Perpetual Submariner is a line of watches manufactured by Rolex, designed for diving and known for their resistance to water. The Rolex Submariner is part of Rolex's Oyster Perpetual Professional line.
The Rolex Sea-Dweller, introduced in 1967, is a heavier-duty version of the Submariner in steel, with a thicker case and crystal. The Sea-Dweller incorporates a helium escape valve for use with helium-based breathing gas mixtures in saturation diving.
The Sea-Dweller was superseded by the Deep Sea Sea-Dweller in late 2008 with the last few 16600 Sea-Dwellers produced running into the V-series (late 2008)
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