27 June 2012
Exhumed rocks reveal Mars water ran deep
By studying rocks blasted out of impact craters, ESA’s Mars Express has found evidence that underground water persisted at depth for prolonged periods during the first billion years of the Red Planet’s existence.
Mars Subsurface Water Study Press Release
Full Version: MEX & MRO Detect Ancient Sub-Surface Water Deposits
This would seem to be a better landing site for Curiosity than Gale crater. Is it too late to retarget> 
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