I know why deep diving watches need helium release valves. But that model is a 2000 ft model without the valve.
During deep Saturation diving most of the time is spent in a bell and chamber. You stay at the working pressure until the job is complete. Then the long. Up to 30 day decompression is started.
Helium and other inert gases are used at depth. Helium is a very small molecule, and can actually slip between the seams and gaskets of most devices and get inside a watch. Then while ascending pressure builds up and it needs to be released from inside the watch.
During deep Saturation diving most of the time is spent in a bell and chamber. You stay at the working pressure until the job is complete. Then the long. Up to 30 day decompression is started.
Helium and other inert gases are used at depth. Helium is a very small molecule, and can actually slip between the seams and gaskets of most devices and get inside a watch. Then while ascending pressure builds up and it needs to be released from inside the watch.