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It was another student, Lujendra (“Luju”) Ojha, also working on DTM production, who finally caught the small lineae on crater walls growing between images. After Luju raised a flag to the HiRISE Principal Investigator Alfred McEwen, the hunt was on to track down the origin of the strange lineae. They were first discovered in the mid-latitude southern highlands (published by Alfred and coauthros in Science in 2011), but are now known to be abundant in equatorial regions (announced in Nature this year), particularly within the deep canyons of Valles Marineris.
Use satellites how? Drill for it how?
Use satellites or drill for it.
GRACE uses changes in local gravity fields to monitor changes in groundwater quantities. If there is liquid water beneath Mars' surface it probably would be quite static so there wouldn't be any indication to show its presence. But perhaps in the future there will be gravity mapping missions to Mars. Perhaps the data from them could be used.
NASA uses GRACE satellites to monitor groundwater on Earth.