BlueTrin, if you want to read about other divers' fatal mistakes and what you can learn from them, check out the Lessons for Life column in Scuba Diving magazine online, or the book Diver Down.
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It's very easy for an inexperienced diver to panic at depth, which typically results in a reflexive, instinctive rapid rush to the surface to "get to safety". Bad things tend to happen under such circumstances. As per your example, few people tend to panic while riding a motorcycle around a track and if they do they can simply stop what they're doing.
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