Promaster Eco-Drive Professional 1000m diver's watch BN7020-09E The BN7020-09E is the world's first light-operated diving watch suitable for saturation diving. The new flagship of the Promaster Marine collection uses a wide range of Citizen technologies, resulting in robustness and even greater water resistance. A diver's watch, which is to be suitable for 1000m saturation diving, must not only undergo the water resistance test, but also a test in which the diver's watch remains 15 days in a pressure chamber containing helium and oxygen or 100% helium gas. It is then returned from the pressure chamber to the atmosphere outside the…