Kinda clickbaity. Not a cavity with water, fish can't swim through it. Apparently there is a mineral that can soak up water. Which is cool I guess, but I wanted a hiding place for Megladon.
Scientists find vast underground ocean with more water than Earth's surface
Scientists have recently discovered a vast ocean concealed beneath the Earth’s crust as an immense reservoir of water, stored in rock known as "ringwoodite", 400 miles below the surface.
originally posted at https://stacker.news/items/669424
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