The maps provide insight into the comprehensive defensive networks during WWI and WWII and detail Booms, AA Batteries, Searchlights, Radar stations, Coastal Batteries, Blockships and Anti-submarine/torpedo boat nets around Scapa Flow and throughout the Orkneys Islands. All these static and non-static defences created the largest fortified naval base in the world. Having once dived in Scapa Flow I find the maps of interest and would certainly use the book as a guide if I was lucky enough to go there again.
![9781846033667M1](http://farm3.static.flickr.com/2516/3765280447_84eb05fa46.jpg)
![9781846033667M2](http://farm4.static.flickr.com/3500/3766071596_4c20ff281b.jpg)
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