For the first time, scientists discovered multi-cellular life more than one mile underground in a gold mine in South Africa. That life, a nematode, has been nicknamed "the worm from hell" because of its depth and the hot conditions under which it lives. Scientists speculate that, on a planet like Mars which only recently cooled and then froze, the changing conditions could have driven life there underground -- and that this worm proves such an adaptation might be possible.

Watch the video, which first aired on Fox News on June 26, 2011, below: