> This new research finds that these RSL features are flows of granular material and thus, align with the long-standing hypothesis that the surface of Mars lack

> This new research finds that these RSL features are flows of granular material and thus, align with the long-standing hypothesis that the surface of Mars lacks flowing water. Small amounts of water could still be involved in their initiation in some fashion, as hydrated minerals have been detected at some RSL locations. The authors conclude that liquid on present-day Mars may be limited to traces of dissolved moisture from the atmosphere and thin films of water. So, this article says there's no water on the surface of Mars, rather than underneath it. Though it looks like this suggests that water beneath the surface is unlikely to be there as well?