According to Dr. William Morgan,
More than half of the scuba divers in our study reported that they
had experienced panic or near-panic episodes on one or more occasions.
The cause of death in more than 60 percent of scuba diving
fatalities is listed as drowning, usually caused by such specific problems as lack of air,
entanglement (in fishing nets, rope or kelp), air embolism, narcosis — and panic. Most studies of diver fatalities define a diver as someone certified
as a diver. This is problematic because some individuals (1) scuba dive, but have not been
certified, (2) are certified and never dive, and (3) may hold as many as 25 advanced level
certifications, with the result that such a diver would be treated statistically as 25
divers. And, risk estimates in this activity have not considered the fact that someone who
dives once in a given year is treated statistically in the same way as a diver who makes
several hundred dives.
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