# Scientific research on Earth's deep water reservoirs > Developing situation record from CLSTR: https://clstr.news/situations/scientific-research-on-earths-deep-water-reservoirs > Updated: 2026-10-27T15:53:00.000Z. Sources: 4. Developments: 2. Researchers have identified evidence of a massive water reservoir located in the Earth's transition zone, approximately 660 km below the surface. This water is not liquid but is trapped within the crystalline structure of the mineral ringwoodite, which acts like a sponge to retain hydrogen. Findings suggest this reservoir could potentially hold three times the volume of all surface oceans combined. Supporting evidence for this hydrated layer includes a diamond found in Mato Grosso, Brazil, which contained ringwoodite with approximately 1.5% water by weight. These discoveries have led to new theories regarding the origin of Earth's water. Rather than being delivered solely by icy comets, scientists propose that water may have been produced locally through chemical reactions involving iron-oxide-rich rocks in the planet's early, hydrogen-rich atmosphere. ## Timeline ### 2026-10-27: Scientists propose new theories on Earth's water origins and deep reservoirs Scientists have identified deep mineral-based water reservoirs in the Earth's mantle and proposed a theory that Earth's oceans formed from chemical reactions in the early atmosphere. 2 sources. https://clstr.news/cluster/scientists-propose-new-theories-on-earths-water-origins-and-deep-reservoirs ### 2026-10-26: Scientists discover massive water reservoir 660 km below Earth's surface Researchers have discovered a massive reservoir of water trapped in ringwoodite 660 km below Earth's surface, potentially containing three times the volume of all surface oceans. 2 sources. https://clstr.news/cluster/scientists-discover-massive-water-reservoir-660-km-below-earths-surface --- Cite as: Scientific research on Earth's deep water reservoirs. CLSTR, https://clstr.news/situations/scientific-research-on-earths-deep-water-reservoirs