https://www.theregister.co.uk/2018/07/26/mars_water_found/

Scientists have discovered a lake of liquid water on Mars hidden beneath multiple layers of dust and ice, according to a paper published in Science on Wednesday.

It has long been suspected that the Red Planet is not as dry and arid as it looks. Over the years, spacecrafts and rovers have uncovered evidence of its watery past. They brought back images of streaks on its surface carved from hydrated minerals, and chemical fingerprints of clay minerals inside its rocks, and signs of water-ice at its poles.