Skindiver,
I think you're right on the mark. Although, during the anaerobic phase, you are first consuming ATP/CP then glycogen+glucose which produces the acid.
Your description is an example of why I always sprint to the surface on deep dives, even though I descend very slowly. Sprinting also reduces the time in the 'death zone' above 15m where you suffer the vacuum effect as each heartbeat causes blood to deoxygenate as it passes the lungs. In a sense, you 'escape' shallow water blackout by passing through the death zone too fast. This is in addition to the other effects you mentioned.
Eric Fattah
BC, Canada
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