Since 2008, the Oyster Perpetual Rolex Deepsea has continued the history of Rolex watches devised for deep-sea exploration. It is fitted with the Ringlock system and is waterproof to 3,900 metres (12,800 feet), a depth at which no human can survive while scuba diving. In this way, Rolex pushes its own technical limits with a watch as durable as the submersibles that descend to the abyss. Its unidirectional rotatable bezel with a 60-minute graduated Cerachrom insert, Chromalight display and reinforced waterproofness, make it the ideal companion for the heroic divers who defy extreme depths.