June 6th, 1944. We all know the story of D-Day, the Allied landings on the beaches of Normandy. However on April 27 and 28, 1944 off the south coast of England at Slapton Sands, what was to be a full scale rehearsal of the D-Day landings turned into a disaster that almost put the entire Normandy invasion in jeopardy.

To this day, the official death toll from April 28th stands at 749 men killed. Now, historian Richard Bass digs deeper into the mystery, secrecy and controversy that surrounds Exercise Tiger. His research uncovers evidence that the death toll may be much greater than the official account states.