Designed and built from 1984 – 1991, these images show you what it was like inside Biosphere 2 right before the first mission began on September 26, 1991, 20 years ago today. Eight people lived inside for two years setting world record for human life support. Grew their own food, recycled their air, water and wastes, the early Biosphere 2 experiment in closed ecological systems taught us many important lessons about how our biosphere works to support us.