QUOTE (scalbers @ Nov 27 2016, 07:44 PM)

Should be about 15mb of max air pressure and water boiling point of 13C.
13 degrees? I still feel that's a bit chilly for a swim.
Serious: Hellas have indeed been mentioned as the best candidate for potential liquid water, even if it might only be in the form of a bit of humidity today.
Now that assumption was most likely based on potential airpressure alone, now BuckGalaxy migh thave pinpointed the very spot where there might be a fraction more of that.
This polygonal terrain JRehling mention is indeed a sign of that the area have dried up at some point.
There's a hypothesis that Mars undergo warmer and more benign periods from time to time, if water have been flowing here comparatively more recently - 10-100 kiloyears or so, it must have been so smallscale we cannot see it in the image resolution we now have for the area.