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[quote=Anonymous][quote=Anonymous]Weird and interesting story. We haven't heard much about the condition of the bodies, but google the Cameroon carbon monoxide cloud, a cloud of CO2 that escaped from a lake and killed thousands, including people, animals, even insects. It does say that people were bloody and covered in vomit, and it seems the news articles would have included this if it were the case with this family. [/quote]

Point of order - that suffocating sensation you get if you hold your breath a long time is your body sensing a surplus of CO2 (carbon dioxide), not sensing a lack of oxygen.  If your lungs are flooded with gases that are oxygen-poor but also CO2-poor such as high concentrations of CO (carbon monoxide) or other inert gases, you will not get a sense of suffocation; you just ... go to sleep.  Because inert gases are frequently used in industry for spark and fire suppression, there have been numerous mass casualty incidents when the inert gas has not been properly ventilated.  A person goes in and after a few seconds, falls over.  The next person goes in to check on them and falls over.  The next person goes in, etc, until there are multiple dead people.  Sadly, this could be avoided by adding a relatively small amount of CO2 to the inert gas mixture.

But anyhow, the incident in Cameroon involved CO2 and was, no doubt, horrible.  Asphyxiation with inert gas is possible the nicest way to go.  It also leave no forensic evidence aside from the asphyxiation itself.  With asphyxiation from CO, the side effects really depends on what the CO is mixed with.  For example, mixed with car exhaust, there are a lot of other gas that cause nasty effects.  A high concentration of CO would be pretty painless and quick, though.

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