What was found 250 miles below the surface?

Researchers have discovered a vast reservoir of water trapped in a mineral called ringwoodite, located about 250 miles below the Earth's surface in the transition zone between the mantle and the outer core. This water is not in liquid form but is bound within the mineral's structure, suggesting that it could hold significant implications for understanding Earth's water cycle and geological processes. The presence of this water may also influence volcanic activity and the dynamics of tectonic plates.