Mars Underground: The Harsh Reality of Life Below

This article begins by stating that any chance of finding life on Mars is definitely going to be underneath the surface. Researchers believe that the surface of Mars is too harsh to harbor life. However, scientists know that at one point there was a lot of water on the surface of Mars, and since water has been found to be the golden key to life, scientists had speculated as to where life may have been present. Recent findings indicate a location where there was a mass amount of water on the surface, hence, indicating where life is likely to be found underneath the current surface. Scientists found this location due to the high sulfate and salt concentration in the area. The space craft Opportunity is being used to take samples from the surface to search for any chances of life.
http://www.space.com/scienceastronomy/mystery_monday_040308.html