Water ice exists on Mars in Korolev crater which holds a ice that is 1.8 kilometers thick.
http://www.astronomy.com/news/photos/2018/12/mars-korolev-crater-a-massive-reservoir-of-water-ice
Water ice exists on Mars in Korolev crater which holds a ice that is 1.8 kilometers thick.
http://www.astronomy.com/news/photos/2018/12/mars-korolev-crater-a-massive-reservoir-of-water-ice