I attended the Blue Wild Show in Fort Lauderdale last weekend. One of the speakers was Dr Neal W Pollock. He is a Research Director at DAN, and a Research Associate at the Center for Hyperbaric Medicine and Environmental Physiology at Duke Univesity Medical Center.

Here is a link to The Underwater Marketing Company Facebook album; 2013 Blue Wild Show (Fort Lauderdale) | Facebook If you scroll through, you will find half a dozen slides with comments from the talk pertaining to safety and physiology.