A good handbook by Mr. Lenton. While the United States Navy had the advantage of the world's largest shipbuilding community, the RN did not. This book outlines the efforts made by a country with fewer financial resources to build a submarine arm capable of offensive action in Northern and Mediterranean waters while having some capacity for more defensive action in the Far east and Pacific. Eventually, the small "U" and "V" classes held the ring in the North, the Med. and the Baltic, while the "S" and "T" classes were a force in Eastern waters. While not so well publicized as the USN's efforts, respectable results were obtained. The statistical format is acceptable, and four interior layout drawings, along with the photographs resulted in a useful volume. ( )