Although this is a work of fiction (ala Dan Brown / Steve Berry), the plot is centered around facts that are historically sound. There were some archaeological and anthropological information about ancient civilization around the Mediterranean which I found intriguing and painted a more 'complete' picture of ancient history. (These parts of the book, I liked.)However, a significant part of the book read too much like a textbook, with overly detailed methods of (among others): deciphering ancient languages, the technology of sea-going ROVs, the anatomy and weapons array of a nuclear submarine, etc. I plodded though gamely, but a lot of it was just over my head (ie: eyes-glazed-over information). Otherwise, it's a pretty good read.