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After a series of experiments, geologists have come to a rather startling conclusion. There may be a ocean-sized amount of water far beneath the Earth, trapped inside the high-pressure mantle zone between our planet's liquid metal core and its outer crust.

For decades, geologists have speculated about what created Earth's vast oceans of water. One popular theory is that icy comets crashed into the planet, eventually melting into oceans. But another theory, which now seems more plausible, was that Earth was already packed with water when it formed. As the planet coalesced out of dust and rocks, that water became trapped in various rocks below the crust.