'Fascinating...a great historical military account and essential reading' John Volanthen, author of Thirteen Lives. The untold story of the D-Day scientists who changed special operations forever. On the beaches of Normandy, two summers before D-Day, the Allies attempted an all but forgotten landing. Of the nearly seven thousand Allied troops sent ashore, only a few hundred survived the terrible massacre, and the reason for the debacle was a lack of reconnaissance. The shore turned out to be impassable to tanks. The Nazis had hidden obstacles in unexpected places. The fortifications were more numerous – and deadly – than imagined. The Allies knew they needed to take the fight to Hitler on the European mainland to end the war, but they could not afford to be unprepared again. A small group of eccentric researchers, experimenting on themselves from inside pressure tanks in the middle of the London air raids, explored the deadly science needed to enable the critical reconnaissance