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> Then it happens, the most weird feeling in the back of my head rising up as > though to engulf my mind in a kind of dizziness. I switch back to my air and > get the attention of the other diver nearby and I hold onto him whilst it > passes. I signal to him that something isn't right with my deco mix, which is [etc.] > What I would like an opinion on is given the dive profile and the added > fatigue I experienced do you think I was on the verge of getting an O2 hit ? Lawrence, I have found that I consistently get symptoms vaugely similar to what you describe whenever I breathe a mixture with a PO2 in excess of about 1.7 atm or so. My symptoms are very subtle, though - more of a slightly confused state of mind (but different from narcosis) than dizziness. I never noticed this in my days of deep air diving, because whenever the PO2 was that high, the narcosis masked it. I don't know what it is, or if it's indicative of an imminent convulsion, or what. I understand that these symptoms are similar to the "aura" experienced by epileptics immediately preceedign a seizure. On the other hand, I have been exposed to MUCH higher PO2's, sometimes with heavy exertion, but have never convulsed. Aloha, Rich
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