How would humans fare in a self-sustained environment? In 1991, eight men and women sought to answer this question. The results, however, were less than encouraging. Without intervention, they would likely have not survived. This speaks volumes about ideas such as starting a colony on the moon, or even, one day, Mars. The planet sustains life in ways that we do not even realize, and we have yet to find a way to survive on our own for an extended period of time.