No operation in the history of warfare has matched D-Day in terms of scale, ambition, or achievement. More than 75 years since the historic Allied invasion, conflict archeologists are still uncovering hidden evidence on and off the shores of Normandy, thanks to cutting-edge drone technology. Follow one team as it examines the now-buried site of a British commando raid that liberated Port-en-Bessin. Then watch as wreck investigators and underwater drone operators hunt for amphibious tanks that were designed to play a crucial role on D-Day.