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I was under the impression that abundant evidence of water on Mars had already been found, though I suppose this adds to the pile.

There's this from 2008:

https://www.space.com/5546-proof-water-ice-mars.html

It seems to show evidence for subsurface ice on Mars now, though I'm not sure if this is H2O ice or CO2 ice.

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>There has long been debate in the scientific community about whether Mars had an ocean in its low-elevation northern hemisphere, Cardenas explained. Using topography data, the research team was able to show definitive evidence of a roughly 3.5-billion-year-old shoreline with substantial sedimentary accumulation, at least 900 meters thick, that covered hundreds of thousands of square kilometers.

I feel like the announcement that bodies of water have been found on Mars has been made every few years since the late 19th century. You'll have to drill into the details to learn what they actually found.

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