Large-scale popularization of the story came about in 1979 when the author Charles Berlitz, who had written a best selling book on the Bermuda Triangle, and his co-author, ufologist William L. Moore, published The Philadelphia Experiment: Project Invisibility, which purported to be a factual account. The book expanded on stories of bizarre happenings, lost unified field theories by Albert Einstein, and government coverups, all based on the Allende/Allen letters to Jessup.
Large-scale popularization of the story came about in 1979 when the author Charles Berlitz, who had written a best selling book on the Bermuda Triangle, and his co-author, ufologist William L. Moore, published The Philadelphia Experiment: Project Invisibility, which purported to be a factual account. The book expanded on stories of bizarre happenings, lost unified field theories by Albert Einstein, and government coverups, all based on the Allende/Allen letters to Jessup.