The book is understandably written and the major aspects of submarine design, principles and structure are explained in a very comprehensive and illustrative manner. An overvieuw of the first submarines gives you an understanding of the evolution in submarine design. Although the book focuses more on military submarines all basic principles are explained and taken into account. From bouyancy, trim, weight assesments everything is explained in basic terms. The book is not complete in a way that someone could actually design a submarine (for example you would have to read and understand more about hydraulics or high pressure valves, air cleaningsystems and so on) but in essence all major topics are included as with the prelimary formula's (for example stability calculations or pressure hull weight). In other words the book is complete and I would consider it the basic handbook in understanding the principles in submarine design for submarine enthousiasts or naval architecs. The book starts with explaining the basic terminology which is needed to understand the rest of the material, it reads very easily so anyone with a mere interest in submersibles (not only naval architects)can enjoy the matters which the authors are dealing with. As mentioned before the book is more focused on military submarines (explaining the role of the submarine, submarine tactics, nuclear propulsion vs diesel electric or a comparison on how torpedo's can be launched). This too is quite interesting even for those who do not specifically search for data on military submarine's. I can recomend this book to anyone interested in the technical aspects of submarine's and I am certain that you will enjoy it as i did.