Oceans Deep in the Mantle

Last week I linked to a Daily Mail article about evidence of large "oceans" of water several hundred miles deep inside the Earth's mantle (see my Nov. 26, 2016 daily briefing). I saw a couple more articles on the topic today, including an interesting quote from one of the researchers. From The New Scientist (underline mine):

“If it wasn’t down there, we would all be submerged,” says Steve Jacobsen at Northwestern University in Evanston, Illinois, whose team made the discovery. “This implies a bigger reservoir of water on the planet than previously thought.”