maybe what you're experiencing is more squeeze and lack of ability to equalize down there then that of running out of oxygen.. how are you feeling on the return of a 15 meter dive.. are you fine when you get back to the surface? if so, then it's not a lack of oxygen, it'd be more related to squeeze and psych. That stretch from 15 meters to 20 meters took a bit of getting used to before I made it there.. I definitly needed a good full set of lungs to carry out the necessary equalizing. Don't be burning up your oxygen getting down there or back up.. take your time. It's just a short trip...
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