Then perhaps this civilization learned to use element 115 for antigravity travel and even interstellar travel. It then expanded out without leaving much trace or evidence. (hivelink)
Perhaps this non human civilization has been on earth for over 100million years but was forced to live underground when 65 million years ago a large explosion caused the earth temperatures to drop many degrees below their preferred.
(hivelink)- This non human underground civilization might be hoarding the element 115 deposits for their own purposes, reluctant to let humanity share a fair benefit from the sales and use of element 115. tid:3432 (1) (hivelink)
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