dave t

My experience was the diver took two or three breaths of air (at 44m) before convulsing, the reg fell out but I managed to put it back as the diver regained some composure quite quickly, he took three or four more breaths before convulsing again. Thats when we went for the surface...fast!!

I would questimate the diver had been breathing o2 at about 4bar p02 for about ten miniutes and the first signs I saw in him was confusion but thats probably cos he knew some thing was wrong but all three cells were at 1.3 bar or just under.

I understood that co2 convulsions were much rarer than o2 convulsions when it came to the off effect but I am no expert!!

best

Dave