Ancient water in the Earth's crust estimated at 2.5 million cubic miles.

[True Federalist (진정한 연방 주의자)]

How long until creationists start arguing that Genesis' "fountains of the deep" referred to this underground reservoir, and that its discovery proves the historicity of Noah's Flood?

I wouldn't be surprised if some of them have already done so despite the fact that if brought to the surface, it would only cover the Earth to a depth of 40 cubits or so,