An ocean's worth of water may be buried within Mars, but can we get to it?

NASA's InSight mission has discovered enough water within the crust of Mars to cover the planet's surface. The water is buried several kilometers underground and was detected using a seismometer that recorded marsquakes. The data showed that many of the seismic waves had passed through rock saturated with liquid water. However, reaching this water is currently impractical for astronauts. [Extracted from the article]