Have you ever watched "Man vs. Wild" ? If you have we implore you to catch another episode when you can.
Although this time watch the episode keeping extremophiles in mind.
Again these are microbiological life forms that can survive just about anywhere. If you were to ever happen upon an extremophile you'd be amazed at where you found it.
Just as anyone who stumbles upon Bear Grylls and his camera crew are most likely astounded by where they found him. Bear Grylls is a great human analogy of what an extremophile is.
Any space missions to Mars in the future might do well to bring Bear Grylls, a "Born Extremophile".