I found this clip on the BBC documentary "To boldly go" (part 2) with Dr Kevin Fong. In the video he is taken to a simulated high altitude and removes his oxygen regulator. He is then asked to perform basic tasks.
It shows very clearly how quickly you become unable to help yourself to get yourself out of trouble. It's very interesting and somewhat unnerving to a CCR diver. Note the euphoria he experiences.
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