Is it difficult to get water on Mars?

  If humans want to colonize Mars, they must first solve the problem of water use. Mars’ atmosphere is too dry to extract water vapor from it, and early signs of surface water (such as the Mars Canal) are now considered to be sandstorms. There is indeed a huge layer of ice on the surface of Mars, but the previously detected ice is located at the unsuitable poles, where water is taken and transported to a place where it is suitable for living. The cost is too high.
  Fortunately, in 2018, the US Mars Reconnaissance Orbiter discovered underground ice beneath the poles. These layers of ice may be over 130 meters thick and covered with rocks and dust several meters thick. These places may be the best place to get water in the future.
  Related water abstracting techniques have also been developed on the planet. In the early 1960s, an underground water intake system called “Rod Well” was used in the military camp of the US military in Greenland. The working principle is to drill through the ground until the underground ice layer; where the ice melts to form a groundwater pool; then the water is pumped up. As long as there is continuous heating, a stable underground water supply system can be built. The technology is currently widely used at the poles, such as the Amundsen-Scott study station in Antarctica. Researchers believe that the technology can be used on Mars in the future.
  A research team recently simulated the operation of a Rhodes well on Mars. They found that melting ice with 9 kilowatts of electricity theoretically produced about 380 liters of water a day and could maintain a constant size pool underground. This is close to the daily water consumption of Americans, which is 10 times the daily water consumption of each astronaut on the International Space Station. Therefore, it should be sufficient to supply some of the early explorers on Mars. Despite this, they were initially required to bring water first because there was no guarantee that the first Rhodes well on Mars would work properly – and no one would be trapped on Mars without water.