The strength of this book is the breadth of coverage. Starting with chapters on propulsion, nuclear, air-independent combustion, and fuel cells, the author then covers hydrodynamics, acoustics, weapons, sensors and then tries to wrap up the overall outlook for the next few decades. The weakness of this book is that it reads like a collection of magazine articles dated about 12 years ago. Since the author was editor of Navy News & Undersea Technology from 1988 to 1994 this is not suprising. Although a lot of information is presented, much of it is in the form of extensive quotations from folk trying to sell one technology or another. This is not wholly bad, but there is little or no attempt to set up a framework for independent judgement about the technical alternatives being considered. No real mathematics is used in description and actual data is, perhaps unsuprisingly, sparse and sketchy. Each chapter reads a bit like a collection of articles rather than a structured essay, but if you read a lot of defence magazines it will seem familiar.
A redeeming merit of the book is that the extensive attributed quotations are trackable and accessible and there is a useful appendix of related websites. To some extent I agree with another reviewer that more information can be found from current open web sources than in this book, but it is a fair introduction in one short volume. There are some small editing glitches typical of on-demand publishing but they do not get in the way of the content.