Where are the enormous, ancient reservoirs of water hypothesized to be located deep beneath the Martian surface?

Answer

Locked away far below the ice caps or within the crust itself

In addition to surface evidence of ancient rivers, scientific investigations point to the presence of massive, ancient water stores situated deep within the planet's interior. These reservoirs are hypothesized to be substantial enough to be equivalent in volume to large terrestrial seas or even oceans. They are believed to be locked away far beneath the existing polar ice caps or sequestered deep within the planetary crust. Scientists theorize that this deep accumulation acted as a massive sink, insulating the water from the harsh surface conditions that caused the atmosphere to thin and surface water to be lost, representing a substantial portion of the planet's original water mass.

Where are the enormous, ancient reservoirs of water hypothesized to be located deep beneath the Martian surface?

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