I'd seen an interview with the author on a programme on the Discovery channel and thought that it looked interesting. Having read
Underworld: Flooded Kingdoms of the Ice Age I was looking forward to the same sort of thing (thought provoking evidence backed up by photographs, diagrams etc, well explained etc) but Graham Hancock is a journalist and Jim Allen - bless his socks - is an ex RAF Cartographer, and it shows.
Jim Allen might well have discovered Atlantis. He might well have discovered all sorts of evidence to this effect and he has certainly made all sorts of conclusions. The problem is that - from his book - the only one of those three statements that I can be certain about is the last one.
I found the book very hard to actually read, ponderous and with little real structure and far less convincing because of that. The photos were borderline holiday snaps and the maps (what I'd have hoped with his background would have been the meat of his argument) were fairly unclear and unconvincing. Maybe if I was a professional cartographer too, I'd have understood more of them and - with a trained eye - said "Oh yes Jim: I get what you're saying!" but - like the vast majority of the readers of this book - that's not my line of work and the book should have been written with that in mind, I feel.
Go back and get some more evidence Mr Allen, present it better in your next book and I look forward to reading it!