According to foreign media reports, Mars Express, the Mars probe of ESA, has found evidence of more liquid water under the ice sheet in the south pole of Mars. Based on data from Mars radar equipment on board the probe, the researchers found three new underground ponds, the largest of which is 20 x 30 kilometers in size. < / P > < p > in 2018, Mars Express team found that Mars’ ice cap is not full ice, but has huge underground liquid water lakes. So they used Mars instruments from May 2012 to December 2015 to map a 20 km wide underground lake with a depth of 1.5 km. Now, by re analyzing the same data, more ponds are found at the same depth. < / P > < p > according to ESA, this lake, like some smaller ponds, is similar to the subglacial lakes found under ice caps in Greenland, Canada and Antarctica. However, because of the freezing point temperature in the polar regions of Mars, the water there can be very salty, so it can remain liquid. This water is likely to be as dead as a salt lake on earth because of its saltiness. However, there are some extremophiles on earth that can survive in very harsh environments, so it may also exist on Mars. < / P > < p > today, the extremely thin Martian atmosphere means that liquid water is unlikely to exist on the surface of Mars, but ESA says groundwater may have existed for millions or billions of years, dating back to the warmer, wetter, lakes, rivers and oceans of Mars. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today