In 1991, four men and four women locked themselves inside Biosphere 2, a three-acre sealed terrarium in the Arizona desert with its own rainforest, ocean and farm, meant to prove humans could live on Mars. Instead the oxygen slid from 21% toward Himalayan levels, cockroaches and ants took over, every pollinator died, and the crew split into two factions that stopped speaking. It's part science experiment, part utopian cult, part slow-motion disaster.
The trailer for the definitive film on Biosphere 2, which frames it as the strangest reality experiment of the 20th century. Sets the mood before you dig in.
History.com's clean overview of the mission — who the eight biospherians were, what they were trying to prove, and how quickly it went sideways.
Space.com traces the project's odd origin: a countercultural theater troupe turned would-be planet-builders, bankrolled by an oil heir.
Archival footage of the sheer ambition of the build: an entire miniature Earth engineered under glass, sealed tighter than a spacecraft.
The day the airlock closed. A geoscience retrospective on what the mission actually measured and what it got wrong about closed ecosystems.
The autopsy. Microbes in the soil quietly ate the oxygen, concrete absorbed the CO2, morning glory smothered the rainforest, and the crew went hungry. The mechanics of a collapse.
The full record, including the chaotic second mission, the management coup that ended with a co-founder sabotaging the airlocks, and the facility's afterlife as a research lab.