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Biosphere 2 Project undertaken by Space Biosphere Ventures, a private ecological research firm funded by Edward P. Bass of Texas.  Biosphere scientist Mark van Thillo is spearfishing, while a tourist observes, inside the artificial ocean of the Biosphere 2 Project during construction. The Ocean 'biome' provided a source of fish during the two-year duration Project. Water that evaporated from the surface of the 'ocean' was condensed and filtered to provide fresh water for consumption and to replenish the freshwater stream.  Biosphere 2 was a privately funded experiment, designed to investigate the way in which humans interact with a small self-sufficient ecological environment, and to look at possibilities for future planetary colonization. 1992