Summary:
- The article discusses a significant study published in *Nature* regarding the discovery of a massive underground ocean on Mars, located within the mid-crust of the planet.
- Scientists utilized data from NASA’s InSight lander to analyze seismic waves, concluding that the detected liquid water could potentially cover the entire planet to a depth of over one mile.
- The findings suggest that Mars may have retained much more of its ancient water than previously thought, shifting the focus for future astrobiological research and the search for signs of past or present life.