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None of this has been referenced in a game or other in-universe source, so it's liable to change in the future. In fact, even if it is ever confirmed on-screen or in-game, it could be different in another telling of the story.
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I always considered the huge cavernous spaces we see, like Monsaic Lines and Necrum to be some kind of proof for this. A lot of areas in AO/AE do at least appear to be subsurface to some degree.