The ultimate in closed habitats.
 

from centauri-dreams.org
Space Imperative: Building Closed Ecologies
by PAUL GILSTER on SEPTEMBER 6, 2012

Long journeys by spaceship are a staple of science fiction, but we know all too little about how to sustain a human habitat in a hostile environment. Experiments in closed ecosystems simply reveal how much work will have to go toward this subject before we can talk about moving out into the Solar System, much less sending missions outside of it. One experiment in this direction was Bios-3, conducted at the Institute of Biophysics in the Russian city of Krasnoyarsk. John Allen, himself deeply involved with the later Biosphere 2 project, called Bios-3 “something of a clandestine legend to the handful of people actually working on closed life systems.”

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