|John G. Fuller. The Airmen Who Would Not Die. (Berkley, 1979, 1980).
According to Fuller's book, the cause of the airship's crash was finally revealed when a psychic contacted the spirits of the airmen who had died in the disaster. No less an aviation authority than Charles H. Gibbs-Smith wrote a note endorsing Fuller's findings and their unusual source. Pretty spooky, eh kids?