Rolex announced the Sea-Dweller New 116600 launch after the Rolex Sea-Dweller reference 16600 was taken out of production at Rolex facilities. This model is known to be the successor of the Sea Dweller. The Rolex Sea Dweller model watch was the first watch to have a helium valve. The Sea-Dweller is the watch for the pioneers of the deep, those who were once known as aquanauts, explorers of the hydrosphere.