Well, the medical staff have confirmed that the cause of death for those killed was Freon poisoning. The casualties include 17 civilians and 3 navy crewmen killed, and 21 injured.
Apparently the submarine was submerged when the incident took place and the compartment bulkheads were locked, which both contained the incident, but also made it impossible to escape.
Interestingly, all of the crew, both military and civilian, are supposed to carry a portable oxygen bottle for breathing in these instances, at all times. Obviously the alarm is also supposed to go off to let them know to use the oxygen. The speculation now is that either they were not carrying their breathers, which would be a gross violation of safety, or that perhaps the alarm did not go off and they didn't know about the gas until it was too late.
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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