In down below image you can see a liquid trail / water seepage in the sand. The soil between the rocks also looks saturated too.
Original NASA Image : HERE
Now a year later, today NASA confirms there is clear indication that flowing water exists on Mars.
According to NASA scientists, trickles leave long, dark stains on the Martian terrain that can reach hundreds of metres downhill in the warmer months, before they dry up in the autumn as surface temperatures drop.
We would not be surprised if in next few years NASA will announce the signs of underground alien life on Mars.