Life Goes Deeper
https://aeon.co/essays/deep-beneath-the-earths-surface-life-is-weird-and-wonderful
Quote:
The amount of water in the subsurface is considerable. Globally, the freshwater reservoir in the subsurface is estimated to be up to 100 times as great as all the available fresh water in the rivers, lakes and swamps combined.
This water, ranging in ages from seven years to 2 billion years, is being intensely studied by researchers because it defines the location and scope of deep life.
We know now that the deep terrestrial subsurface is home to one quintillion simple (prokaryotic) cells. That is two to 20 times as many cells as live in all the open ocean.
By some estimates, the deep biosphere could contain up to one third of Earth’s entire biomass....................
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Things that I've read in the past if I recall correctly is that ground water is only 4-percent of all fresh water, and 90 percent of Earth's bio-mass is in the soil including the seabed. I'm not sure how accurate my memory is, nor how accurate this article above is. Thing is, we are still learning and discovering, and that is pretty cool.