I've read Shadow Divers a couple of times and waited to comment on this thread until I could read Gary's book. If you shift through the "Gary-isms", you pretty much end up with the view that Shadow Divers was as factual as any of the Deep Sea Detectives shows. In other words, the events were dramatized to make the dives seem more dangerous and thrilling than they were and Chatterton and Kohler did all of the important work/research. I'd guess that SD is about as accurate as any celebrity biography or travel/adventure narrative. It was a good read and certainly better edited than any Gary's books - but it would have been better for divers if it had been more factual - maybe not better for book sales, though...