The jaw fatigue thing is from gripping too hard - I get it during the deep air deco stops , but not when using the normal mixes or normal rigs. I have a ridiculously fast scooter I use in the ocean with a single tank rig and that thing drives me nuts unless I am using a long hose (wround my neck to relieve the strain), but the standard open water gear with a scooter is a mouthkiller, as is narcosis, and a reabreather will realy make you crazy without a big mouthpiece when scootering fast
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