Here's a free tip without all the physiological mumbo-jumbo:
If you think/sense you're not going to make it simply remove you mask, pull your hood back somewhat, take off any nose-plug, or whatever is covering your face, upon initiating your ascent. This simple act will magnify your O2-conserving dive response when you most need it, on the way up reducing the risk of a BO.
Seb
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