8 people entered a sealed glass world believing they could survive for two years. Then the oxygen began to disappear

Deep in the Arizona desert near Oracle sits one of the strangest experiments ever built, a sealed, 3.14-acre glass and steel enclosure called Biosphere 2. Constructed between 1987 and 1991 at a cost of roughly $150 million, funded largely by Texas billionaire Edward Bass, it was designed to test whether humans could live inside a fully self-sustaining artificial ecosystem, complete with its own ocean, rainforest, desert, savannah and farmland.

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