This would be the first time they state there's liquid water naturally under one of our machines. For a starter, this is a huge problem regarding environmental protection. Regardless of the other factors against letting something like Conan the Bacterium take residence a few cm under the surface, I suspect if this had been suspected earlier (or those that suspected it were taken seriously), we wouldn't have sent the same kind of probes to the same areas, possibly not even having a Mars ground exploration program at all until we understood better how to do it without polluting the planet with terrestrial life.