The Biggest Cover-Up In History. This documentary tells the tale that the victors still do not want you to know. It was the most deadly and destructive war in human history. Millions were killed, billions in property was destroyed, ancient cultures were reduced to rubble - World War II was truly man's greatest cataclysm. Thousands of books, movies and documentary films have been devoted to the war. There has never been such a terrible retelling of the story, however, as one will find in 'Hellstorm'.