In 1970 OMEGA launched a watch which had been created to withstand the crushing pressures endured by divers working deep below the ocean’s surface. It was the Seamaster 600, the so-called “Ploprof” (the first letters of plongeurs professionnels – the French words meaning “professional divers”) and it was one of the most rugged, robust and seaworthy divers’ wristwatches ever manufactured.