Yes, the latest discovery of the world’s largest reservoir 650 km beneath the surface in North America. This could actually quench the thirst of billions of people in future as per the researchers from North Western University and the University of New Mexico.
The planet’s largest reservoir was found bound up in the mantle in a deep rock. But this is the fourth form of water, not known yet, this is water trapped inside the molecular structure of the minerals in the mantle rock. This is not ice, liquid or vapour, such fourth form of water can be so deep inside the earth due to plate tectonics which eventually causes partial melting of the rocks found deep in the mantle.
Scientists have been looking for this missing deep water for decades, which might give evidences for the whole-earth water cycle.