A probable active glacier has been identified for the first time on Mars.
The icy feature has been spotted in images from the European Space Agency's (Esa) Mars Express spacecraft.
The young glacier appears in the Deuteronilus Mensae region between Mars' rugged southern highlands and the flat northern lowlands.

Read more (http://news.bbc.co.uk/1/low/sci/tech/7151190.stm)

Nice to see that there is some water about on the surface of Mars, and so probably lots about underground.

I noted the report talking of the water turning directly into gas. Should be water vapour.