Europa: life elsewhere?

At the Jet Propulsion Lab. scientists and engineers are spearheading far-reaching research efforts to prove beyond all doubt that life exists, or once existed, elsewhere than on Earth. In their most promising initiative, they hope to land a probe on the surface of Jupiter's moon Europa, considered a likely site for extraterrestrial life, within the next 15 years. As planned this autonomous vehicle will melt down through the ice to a vast ocean below where it will conduct tests to investigate if life exists there.