I look forward to this thread. 
What I don’t understand is how the Turks could have supposedly accurate maps of Antarctica, but no maps of NORTH AMERICA! On the map Africa looks good, Europe looks good, even the east coast of South America looks good. But North America is just a jumble. Why would the aliens not have a map of North America?
One thing I hate about Hancock is that his publishers insist his books are “history” or “science” and that they be shelved accordingly, instead of in “New Age” where they belong.
Hancock isn’t a complete idiot or anything, his theories don’t violation known laws of physics like many of other writers in the field. But after applying Occam’s razor, there is precious little left. He specialises in taking far out improbable theories, and compounding them.