Researchers used high-pressure experiments to show that bridgmanite could store between 0.08 and 1 time the volume of all the world's oceans in the lower mantle.
That's up to 100 times more than earlier guesses.

This discovery suggests Earth has a massive, hidden stash of water below our feet.
It could help explain how our planet cooled down, became habitable, and why its geology works the way it does, a reminder that there's still so much left to uncover beneath the surface.