Defeating the safety... harbinger of so many Darwin Awards.
Sixteen minutes into the dive, he was alone and out of air--a situation that should never sneak up on a diver. But he turned off the safety alarms and swam out of sight of his buddy! The diver made an emergency ascent up the anchor line. At 18 meters the divemaster tried to assist him, but the panicked diver refused to take an alternate air source. He continued his rapid flight to the surface, where he lost consciousness and could not be revived.
The cause of death: "Air embolism (nitrogen bubbles) due to rapid ascent."
Was it an accident? This experienced diver deliberately disregarded two basic safety rules: pay attention to your gauges, and stay within reach of your buddy. If he had attended to his gauges (and not turned off the alarms) he could have made a controlled ascent, including a decompression stop for safety. If he was near his buddy, they could have shared air as they both made a controlled ascent. Either precaution would have saved his life.
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Reference: Alert Diver Magazine, "Breathless on the Bottom," March/April 2007