The sport that is the burden of risk to some extent and diving! I think the probability of an accident is low as possible, but at the time (in the license course, you can study for safety) and had an accident, then, to be a sport probability of serious accidents is high. That's why, in order to reduce the probability that we professionally meet the accident! In addition, I thought that even if an accident, to be present in order to stave off a minimum the accident.
Scuba Diving