This book is one of the 3 Pisces "Dive Into History" series and is a very well researched and informative book on present-day U-boats wrecks complete with excellent underwater color photography, line drawings and wartime historical photographs. It covers the events leading up to and the circumstances of the sinkings of several U-boats. From the standpoint of the maritime archaeologist, the U-boat historian, or anyone interested in the history of war beneath the waves, especially technical scuba divers, it is a must. The other 2 books in the series I have read, "Warships" and "U.S. Submarines" are equally essential and well done. No submarine book collection is complete without Volumes No.2 and No.3 (U.S. Submarines and U-Boats).
I have 32 different books concerning the U-boats in WWI and WWII in my collection, and some of the most striking images of U-boats are to be found in this book.