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Nitrox is for deep or long, or both. And yes, there's a cert for it. I'd recommend flying up here to Gainesville Florida and do a combo cave and nitrox cert with Lloyd Bailey's outfit...
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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