I like these writers; they are reasonably efficient, for the genre, and are clear about what they intend without subterfuge. This book is an action thriller, meaning that while there are some mysterious elements to it, we the readers know the basics of its development and thus have the pleasure of watching characters adapt to it. Characters... well, they're a slight bit one dimensional, and the action somewhat linear, but the knowledge of submarining here is spectacular and is used to enhance our feeling of being there, of facing the actual threats of being submerged in the sea. For all its faults, I enjoyed this book, and were I its editor, would have demanded a more compelling and realistic plot and slightly tighter action. Still, of all the works in its genre, it's one of the least laughable and most pure entertainment value. I would recommend this book to other experienced readers in this genre.