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Scientists Discover Massive “Ocean” Hidden 400 Miles Beneath Earth’s Surface

It’s not a myth. There may actually be an ocean inside the Earth. And it could hold 3× more water than everything we see on the surface.

Scientists have discovered stunning evidence of a vast underground water reservoir — buried 400 miles beneath Earth’s surface.

At the heart of this finding is a rare mineral called ringwoodite, which exists deep in the planet’s mantle. Unlike any ocean we know, this one doesn’t slosh — the water is supercritical, a strange state that’s not liquid, solid, or gas, but something in between.

How they found it:
By studying seismic waves from earthquakes. When the waves passed through ringwoodite-rich regions, they slowed down — revealing the hidden presence of water.

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Why it matters:

  • This “ocean” could hold 3× more water than all surface oceans combined.
  • It challenges old theories about Earth’s water origins.
  • It suggests a deep-Earth water cycle that’s been active for billions of years.

This discovery could rewrite how we understand planetary evolution, tectonics, and the hidden dynamics of Earth itself.

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