The Rolex Explorer came into being in the same year that Mount Everest was first ascended, 1953.

Today's Rolex Oyster Perpetual Explorer and Explorer II watches are known for their toughness and reliability. They use a robust corrosion-resistant stainless steel to withstand the most extreme environments.

Since 1926, when Rolex invented the first waterproof watch, the company has been known as a leader in conquering the oceans and seas.The watch's case is tested repeatedly in order to ensure that the Explorer's inner working stay protected from the harsh outside environment. source