The original title is "Steep Slopes on Mars Reveal Structure of Buried Ice". The HN title "Buried Ice Water Discovered on Mars" is misleading - we've known about large midlatitude underground ice deposits for some years now.
> The ice was likely deposited as snow long ago. The deposits are exposed in cross section as relatively pure water ice, capped by a layer one to two yards (or meters) thick of ice-cemented rock and dust.
"Ice water" would be something that is served in the restaurants on Mars.