Earth ChangesNeutrinos From Deep Inside Earth Provide a New Picture of the Mantle Posted on August 23, 2026 by Administrator In a laboratory 2 kilometers underground, a crane lowers Matt Depatie (opens a new tab), a detector technologist, through a hatch into a white-walled cavern filled with about 7,000 tons of ultrapure water that glows as blue as wiper fluid in the light. “Splashdown,” Depatie says over a radio as he steps into an inflatable raft waiting below.