One of the most succesful achievements of Nazi war machine were the colossal bunkers build for U-Boats, mainly in Germany, France and Norway. Those cyclopean structures resisted every attempt to destroy them, causing during the whole war an indescriptible fury and frustration amongst Allies war leaders. Some of those build in occupied France were used for many years after war by French submarine force - and French military still uses most of them today.
This book describes very well and in a very interesting way the story of their conception and construction, the way they were used, repaired and improved, as well as the efforts of allies to destroy them - and how those attempts failed. The defenses of U-Boat bases (radars, guns, fighter patrols, naval mine fields, anti-aircraft balloons, etc.) are described in detail, as is daily life of people who lived and worked there. All of this illustrated with a great number of very well selected war time images.
There are also colour plates, but they are not all satisfying. The first two (long range defenses and construction of a base) do not present any interest and are a waste of place. The third one, illustrating short range defences of a base, is a very well done and very instructive one. The plate number four, "Inside a U Boat base" is also a good one, resuming in one image the unique atmosphere of those places. The plate number five, showing the monstrous "Bruno" bunker in Bergen (Norway) is very impressive, as well as the plate number six (on double page), describing the most gigantic U-Boat base in Lorient (France). The plate number seven shows an installation almost as impressive - a bunker-based shipyard in Bremen (Germany) where the super modern type XXI U Boats were supposed to be build in great numbers (the war ended a couple of days before the first one was completed in this facility).
There is also a chapter listing and commenting all the U-Boat bases and facilities (not always as strongly fortified) during WWII, from command post for Arctic in Narvik (Norway) beyond the polar circle, and Libau (Latvia), home of 25 Flotilla close to Leningrad, to naval base of 12 Flotilla at Bordeaux (southern France). The list includes also some very surprising places: Pola (today in Croatia) and Salamis (Greece) which were the bases for 29 Flotilla, Constanza (Romania) and Feodosia (today in Ukraine), homes for 30 Flotilla, but also Singapore, Penang (Malaysia), Batavia (today Jakarta, capital of Indonesia) and even Kobe (Japan)!
This is a little book, but very well conceived and filled with well presented data and also some interesting anecdotes. I think that anybody interested in WWII history, naval history, submarine warfare or fortifications will find it irresistible. I certainly enjoyed studying it and I learned a lot.