cousteau was inspirational. he taught us that the oceans are alive. that was the biggest gift of all that he could ever give to humanity as a single human being. alling: i grew up by the sea, and i sailed as a very young girl, would go out on a small, 12-foot boat and just loved being in the middle of the ocean. narrator: after spending over a decade at sea studying whales, dolphins, and marine life of all kinds, at age 26, gaie alling was invited to take part in a unique experiment. together with her partner, 25-year-old engineer mark van thillo, and a small team of experts, gaie lived for two years inside biosphere 2, a scientific working model of the earth's biosphere. alling: biosphere 2 was a manmade, contained, closed system that was trying to re-create the global ecology of earth's systems. so this manmade world had all the living components necessary to be another biosphere. it was extremely complex, very biodiverse. nothing could go in and out of this system from our earth's biosphere except information, so it was materially sealed off as a l