Recent research indicates that there may be substantial quantities of liquid water beneath Mars' upper crust. A paper published in the National Science Review discusses how seismic data from the Mars InSight lander suggests the existence of a potentially water-saturated layer between 5.4 and 8 kilometers below the surface. This finding challenges earlier notions that Mars' water had completely evaporated or was stored in small amounts. The estimated water is enough to form oceans 520-780 meters deep on the planet's surface, similar to Earth's aquifers.
"Our findings suggest that there is a substantial amount of liquid water trapped beneath Mars' upper crust, potentially comparable to Earth's aquifers."
"Seismic data reveals a layer of porous rock at depths of 5.4 to 8 kilometers, which we believe is saturated with liquid water."
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