What is intriguing here is that this work provides essentially correct timelines that was not easily available even recently regarding the Great flood and the preceding civilization. I have been associating Atlantis with the European Bronze Age which spawned a global trade empire not unlike that of Britain more recently. Here like so many others the name is associated with the pre Pleistocene Nonconformity global civilization that also certainly lasted around fifteen thousand years from 12900 BP through 30,000 BP. I would extend all that further back in time to 45,000 BP except that the actual development of civilization may well have consumed a good 15,000 additional years under natural conditions without handy interventions.
In short, much of what is reported here fits in well with our developed alternative history. However, he has used the device of a huge Nuclear War and a lot of implausible geology as well in order to explain the known data points that i have also been relying on. It does not work at all.
Returning back to the developing theme of an accessible inner Earth, we remain completely without any physical corroboration at all and the sheer number of eyeballs seeing nothing must tell for something.
What we continue to have is ample research in terms of times and places along with an insertion of pure fantasy into a whole range of actual claims not physically possible even in 1980 and continuously dis proven since. It certainly makes good use of the underlying historical research and related interviews which surely took place but never truly addressing the fantasy component.
The writer clearly accepts a legendary account of alternate history as somewhat extant and recoverable circa 1980. His interpretation is incomplete in terms of plausible science and geology but as well as could be done then and now for that matter unless you grasp the meaning of my Cloud cosmology...