I remember a Japanese scientist reporting a similar finding perhaps 10 years ago. I seem to remember the submarine ocean being beneath japan at a depth of a bout 200 miles.
Also, dunes of sand in the Gobi Desert are supposed to be saturated with water some distance below the surface, sort of anchoring them they don't move are much as dunes in the Sahara.
I remember that, too. In fact, didn't he predict that the Earth's oceans would completely drain away within the next 100 - 200 million years?