In 1991, Eight People Locked Themselves Inside Biosphere 2 for Two Years. Their Oxygen Fell From 20.9% to 14.5%, and the Culprit Was the Concrete

In 1991, Eight People Locked Themselves Inside Biosphere 2 for Two Years. Their Oxygen Fell From 20.9% to 14.5%, and the Culprit Was the Concrete – Futura-Sciences

October 26, 2026

7 min

In 1991, Eight People Locked Themselves Inside Biosphere 2 for Two Years. Their Oxygen Fell From 20.9% to 14.5%, and the Culprit Was the Concrete © DenisTangneyJr

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