Be AmazedSpace Ukraine Water ice in the Korolev crater on Mars By Andy Lazko - April 12, 2020 0 971 The 50-mile-wide crater contains 530 cubic miles of water ice, as much as Great Bear Lake in northern Canada, and in the centre of the crater the ice is more than a mile thick. Check out my new hardcover book https://www.theguardian.com/science/2018/dec/21/mars-express-beams-back-images-of-ice-filled-korolev-crater