For the first time, a tape recording of director Akira Kurosawa's voice on the set of ``Tora, Tora, Tora!'', an American war movie known for which director Akira Kurosawa was fired during filming, has been discovered. The National Film Archive, which conducted the investigation, said, ``This is a valuable discovery in film history that unravels the mystery of director Kurosawa's phantom filming location.''