Scientists Find Clues of a Massive Hidden Ocean Deep Inside Earth

Scientists have found evidence that a huge water reservoir may exist deep inside the Earth, sitting about 1,800 miles, or 2,900 kilometers, below our feet. Researchers believe this hidden stash could hold an amount of water equal to two Pacific Oceans.

The Discovery

This deep-earth water does not sit in open pools or flowing rivers. Instead, experts explain that the water is likely trapped inside rock layers deep within the Earth's mantle. High pressure and heat at that depth force the water to lock into the crystal structure of underground minerals.

What It Means

Finding this hidden water stash helps scientists better understand how water cycles through the entire planet, including how oceans formed on the surface over billions of years. Researchers used seismic wave data from earthquakes to look deep into the planet and spot clues about these water-bearing rocks.