Timekeeping Icon: Rolex Sea Dweller
As men were pioneering ways to explore and live in outer space in the 1960s, another groundbreaking initiative was taking place closer to home, in an equally hostile environment: the ocean. Parallel efforts by the U.S. Navy, the French commercial diving firm COMEX and diving legend Jacques Cousteau were developing a way for man to live on the ocean floor by breathing a gas mixture made up of a majority of inert helium combined with oxygen. "Saturation diving", as the new method was called, greatly increased possibilities for living underwater by removing the need to frequently come to the surface to decompress.
But a problem was discovered: the crystals of divers' watches were blowing off upon decompression at the end of their time on the seabed. A new dive watch was needed, and Rolex responded with the now-legendary Sea Dweller.