http://news.bbc.co.uk/2/hi/science/nature/6461201.stm
Recently NASA's spacecraft the Odyssey was able to spot Caves around the Arsia Mons volcano. These caves are belived to be important as they may be the only natural structures capable of protecting primitive life forms from micrometeoroids, UV radiation, solar flares and high energy particles that bombard the planet's surface.
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