Summary: This is one of those rare books that you know within the first dozen pages it's going to be a great read and you're going to be disappointed when it ends. Robert Kurson's tremendous research combined with a great historical narrative style results in learning not only about the lives of the living players such as Chatterton and Kohler, but the dead sailors on the submarine as well. While this is Kurson's book, you can see the extensive contribution provided by Chatterton, Kohler and others who shared the experience. This book fits beautifully with "The Last Dive", which I reviewed here a few years ago. I did learn things here, which surprised me relative to "The Last Dive". I thought they had been doing mixed-gas diving much longer on U-869 then just before the Rouse's arrival. Chapter 2 is about the dangers of wreck diving and sets the stage of what to expect throughout the remainder of the book. Kurson makes sure the reader understands this wasn't just a bunch of treasure hunters looking for some "stuff". These guys respected this dive site as sacred resting place for these German sailors and their actions (including their own research) supported that belief. And in the end, I was right...it was a disappointment to see it end.