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: sorry to sound a bit OTT, but would the helium
: release valve actually help, ie could oxygen
: really get through the value which was
: designed for helium. - Would it be better
: unscrew the crown?
The helium relief valve does not release JUST helium. It is essentially a pressure release valve. In its intended function as a diver's watch, the only way the pressure in the watch gets higher that the pressure outside is when helium seeps in through the seals from being in a pressurized helium saturated diving bell environment--so that is why they call it that.
: Also, how often does the crystal 'pop' out
: (rare is not never)
It happens on extremely rare cases. I have no way of compiling statistics on this, but I can assure you if it happened much, you would hear a lot more about it.
: I have a newish SMP, does that make a
: difference?
Acutally, a newer diving watch is MORE likely to have a problem. On an older diving watch, if its seals have weakened with age, it will more likely allow the pressure to equalize.
: Should I leave the crown unscrewed for the
: whole duration of the flight?
Yes. You will have no way to predict when an sudden pressure change is going to occur.
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