Why does hyperventilation before diving cause unconsciousness in divers?

Hyperventilation artificially depletes the resting concentration of carbon dioxide causing a low blood carbon dioxide condition called hypocapnia. Hypocapnia reduces the reflexive respiratory drive, allowing the delay of breathing and leaving the diver susceptible to loss of consciousness from hypoxia. For most healthy people, the first ________ _______ __________ ______ _________ ______ ____ ______.
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