Water in concrete is released by heat. Good thing there is no heat deep in the earth.
What are you insinuating? Don't be shy!
I have acknowledged that ringwoodite contains (a small percentage of) water. So, yes: It is, of course, possible to extract that water.
I suppose that heating might be one way to accomplish that.
Those deep regions of the Earth where ringwoodite is found are ALREADY hot. And yet they are NOT currently shooting up any "fountains" of water towards the Earth's surface.
So, don't be coy! If you insist upon an actual physico-mechanical mechanism for the Biblical narrative: Out with it! What physical process caused the (already hot) ringwoodite to suddenly release the water locked up inside it?
Regards,