Mars could have an ocean’s worth of water beneath its surface, seismic data suggest – Seismic readings of the interior of Mars strongly suggest large quantities of water buried 6 to 12 miles underground.
https://www.space.com/the-universe/mars/mars-could-have-an-oceans-worth-of-water-beneath-its-surface-seismic-data-suggest
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From the article
Persuasive new evidence supporting the possibility of liquid water deep underground on Mars has come to light in a new analysis of seismic data from NASA’s InSight lander.
In 2024, researchers proposed that the deep subsurface of the [Red Planet](https://www.space.com/the-universe/mars/what-makes-mars-the-red-planet-scientists-have-some-new-ideas), particularly between 7.1 and 12.4 miles (11.5 and 20 kilometers) down, [is soaked in liquid water](https://www.space.com/the-universe/mars/oceans-worth-of-water-may-be-buried-within-mars-but-can-we-get-to-it), a conclusion they base on the velocities of seismic waves detected during [marsquakes](https://www.space.com/mars-marsquake-strongest-ever-2022-cause).
Now, researchers Ikuo Katayama of Hiroshima University and Yuya Akamatsu of the Research Institute for Marine Geodynamics in Japan have found supporting evidence for this claim of liquid water deep inside [Mars](https://www.space.com/47-mars-the-red-planet-fourth-planet-from-the-sun.html). “Many studies suggest the [presence of water](https://www.space.com/17048-water-on-mars.html) on ancient Mars billions of years ago,” said Katayama in a [statement](https://www.geosociety.org/GSA/News/pr/2025/25-03.aspx). “But our model indicates the presence of liquid water on present-day Mars.”
This is likely the home of the crab people. We should leave it undisturbed.
Interesting. A lot easier to dig deep on Mars too, as the rock isn’t as hot (and therefore semi-liquid) as it is on earth. If we do want to put a colony on Mars going underground makes a lot of sense, so having some deep boreholes to extract water would not be a bad idea. Instead of terraforming you could build towards a ‘cavern arcology’ civilisation, which would be cool.
Some idiot must have pulled the plug a few million years ago!
That’s quite deep considering the deepest hole we’ve ever dug was ~7.5 miles deep on earth.
As the prophecy foretold, Cthulhu is to be awoken as GPT 10 is released.
Could there be a microscopic life, or is it to warm that far down?