In the mid-20th century, the invention of the regulator revolutionized diving by balancing the pressure between the diver's lungs and their compressed air reserves. This breakthrough fostered the development of diving as a sport and led to the creation of specialized instruments. In 1961, Vulcain introduced one of the first diving watches equipped with a movement featuring an alarm that was audible underwater. This was the Nautical model, fitted with the famous Cricket movement. To ensure the diver could hear the alarm signaling it was time to ascend, Vulcain developed a triple caseback, which acted as a resonance chamber. In 2011, Vulcain reissued this model, preserving the original's aesthetic and technical reliability, solidifying its status as one of Vulcain's most iconic watches.

CronotempVs Collectors presents the Vulcain Nautical "Posidonia", a special edition diving watch that pays tribute to the underwater plant responsible for maintaining the biodiversity of the Mediterranean Sea.