Nearly 80 years on and the evidence from the Dunkirk evacuation is still there, just below the surface of the fields, beaches and sea - waiting to tell a new story. Operation Dynamo and the evacuation of more than 338,000 men from the beaches of Dunkirk in May and June 1940 is one of the most celebrated events in military history. Against all the odds, the Allies orchestrated a near-impossible escape and saved hundreds of thousands of lives. How did they achieve this miraculous feat? This program sheds fresh light on this burning question.