Blizzcon 2009 first WoW panel or potentially lore panel
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No. I said several times, Metzen said he spent a lot of time in Deepholm and due to the proximity to the earth, and the Old Gods being chained beneath the earth, he slowly got driven mad.
I mean yeah, it is an elemental plane, but that doesn't mean it's not in the earth. You literally jump into the Maelstrom to get there. Metzen even said that Deathwing's eruption from Deepholm brings all of the elemental planes "up", or "down" in the case of Skywall.