Reservoir of liquid water found deep in Martian rocks

Reservoirs 11.5 to 20 kilometres below the surface of Mars might hold liquid water. If so, it would be the first found on the planet. The evidence comes from data gathered by NASA’s InSight lander, which retired in 2022. InSight monitored seismic waves created by Marsquakes, which suggest that the planet has a layer of fractured rocks saturated with liquid water deep underground.