During World War II, the world was on the verge of total destruction...but did you know that the war was also full of top secret missions that most people know nothing about? A hidden bomb shelter inside of the Brooklyn Bridge; a clandestine cover-up after a D-Day rehearsal leaves dozens of Allied troops dead; and contrary to what most people have been led to believe, those A-bombs the United States dropped on Hiroshima and Nagasaki weren't the deadliest bombs in WWII...the firebombings in Tokyo were.