They should be using plain old well filtered air. With sort of exhaustion affecting several people I'd be suspicious of contaminated air. If it was just you, more likely to be just not used to the level of exertion and being geniunely worn out...also possible mild DCS hit (aka the bends) could cause those symptoms. Though I wouldn't expect your getting deep enough on SNUBA to make DCS very likely.
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Bill
"LOL, well I have no brain apparently. " - dc (Debi)
Current Tank Info: Far too many tanks according to my wife, LOL.
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