How a lockdown experiment went horribly wrong – a build-up of carbon dioxide

On top of that, oxygen levels decreased faster than anticipated, with a corresponding build-up of carbon dioxide. Earth’s atmosphere is about 21% oxygen, but inside the biosphere it fell to 14.2 %. “It felt like mountain-climbing,” Nelson recalls. “Some of the crew started getting sleep apnoea. I noticed I couldn’t finish a long sentence without stopping and taking a breath of air. We worked in a kind of slow-motion dance, with no energy wasted. If the oxygen levels had dropped any lower, there could have been serious health issues.”

Source: Eight go mad in Arizona: how a lockdown experiment went horribly wrong | Film | The Guardian

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