The scientists have discovered a reservoir of liquid water on which planet?

A study found large amounts of liquid water deep within Mars’ rocky crust, a major breakthrough in understanding the planet. This is the first evidence of liquid water on Mars’ surface beyond the known ice at the poles. The study, titled “Liquid water in the Martian mid-crust,” was published in Proceedings of the National Academy of Sciences (PNAS) by scientists from the University of California. The discovery could enhance knowledge of Mars’ water cycle, climate history, and potential for life. Water is located 10-20 km deep, believed to have seeped from the surface billions of years ago. If widespread, this water could fill an ocean 1-2 km deep across Mars