The crown when opened is still designed to keep the watch sealed. The pressure in the watch is less than outside. I don't think you actually have an issue. I don't think the crown is supposed to be unscrewed at pressure.
I have a few friends that are sat divers for Oceaneering. One actually told me about a fellow diver that had a Sub blow the glass out of a watch. I asked him for picks but never got them. The SD is still the most common watch they said but a lot of the divers switched to oil filled watches too. I think Sinn makes one that's oil filled and can handle any pressure.
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