What is the function of the helium escape valve on the Seamaster Professional watches?
The helium escape valve was specially developed by Omega for use by professional divers. During deep-sea dives lasting several days, divers operate from diving bells. Prior to surfacing, these bells are filled with a mixture of helium and oxygen. The helium molecules are lighter than air and can therefore penetrate the watch in sufficient quantity to push out the crystal at atmospheric pressure levels. This can be avoided by opening the valve during resurfacing, which allows the helium to escape but prevents water from entering the watch.
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