[Seacidal]

I also heard mention of a fourth type of blackout, or perhaps it's just a variant of SWB. That is the "surface blackout", in which the diver regains the surface, exhales or perhaps takes a brief breath, and loses consciousness.

In discussions with other experts, I've noticed the use of "underwater loss of consciousness" used as opposed to other terms. I understood this was done to avoid inferring one particular physiological cause over another, as Eric pointed out previously.

Does anybody have any comments or experience with either "surface blackout" or ULOC?

Thanks,
Chip