Loss of consciousness most often occurs during stage 3 or or long-term immersion stage of cold water immersion.
Hypothermia is a medical emergency caused by your body losing heat faster than it can produce heat, resulting in a dangerously low body temperature.
After 30 minutes or more, stage 3 or long-term immersion hypothermia occurs. Cold water draws heat from the body, causing the core temperature to drop.
Thus, the answer is stage 3 or long-term immersion hypothermia.
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