In 1959, Jaeger-LeCoultre introduced the first automatic diving watch equipped with an alarm: the Memovox Deep Sea. Three years earlier, in 1956, Captain Cousteau had unveiled the splendours of undersea life in his famous film "The Silent World", which caused an unprecedented craze for the new diving techniques that he had developed using air cylinders. The Memovox Deep Sea, water-resistant to 10 bar and with its alarm notifying divers of when to begin their re-ascent, was astonishingly popular.