The Doctor watches back; "Well-, more of a subconscious multiverse. A hub you could say. Where every and all alternate realities are possible and those who are from the same universe can also be from different points in time are at cross roads with each other. Entirely possible for those from other realities to join in with others. Sort of like the void expect not. Not as empty. And Nautilus is a living entity that created this place. That is this place."

Why yes, someone is watching her reactions; and he does wonder if she'll catch on to who he is without him saying. Despite the different color eyes and different face. Those eyes are still older than that young looking face.