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Old 24th Apr 2017, 8:54 am   #217
Brigham
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Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,111
Default Re: Technology related anachronisms on TV and in films etc.

This is correct. It's the CO2 that causes the awareness of lack of oxygen. It's a drawback of the Davis Submarine Escape Apparatus, which is a chemical re-breather.
I often wonder why the technique isn't used for gassing unwanted dogs, etc.. It would cause far less distress.
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