The old battlefields of World War II hold many secrets, including lost sanctuaries, buried atrocities, and forgotten heroes. Now, military experts and conflict archaeologists are using cutting-edge, drone-mounted technology to re-examine some of the European theater's most iconic sites and reveal their untold stories. From Maltese submarine wrecks to a top-secret research base in Scotland to the location of the Battle of the Bulge, this six-part series revisits seminal moments from history's greatest war from an entirely new perspective.