Far from being a modern, internet crackpot idea, hollow earth theory has walked a long and winding path, many centuries old. From the mythological pits of hell, to the pseudo-scientific theories of the enlightenment, right through to modern science fiction, founding philosophies of utopian cults and even tenuous links with the Nazis, the proponents have been many and the theories varied, though whether or not they were ever anything other than crackpot is a different question altogether. SOURCES

Standish, David (2007) Hollow Earth. Da Capo Press, IN, USA.

Bernard, Raymond (1963) The Hollow Earth. Fieldcrest Publishing Co., NY, USA.

Griffin A., Duane (2004) Hollow & Habitable Within: Symmes’s Theory of Earth’s Internal Structure & Polar Geography. Physical Geography, Sep 2004. USA.

Kollerstrom, Nicholas (1992) The Hollow World of Edmond Halley. Journal for the History of Astronomy, Volume 23 Issue 3, August 1992. USA

Halley, Edmond (1692) An account of the cause of the change of the variation of the magnetical needle with an hypothesis of the structure of the internal parts of the Earth. Philosophical transac­tions, xvi (1692), 563-87. UK

Alexandria Gazette (1818) Food For Philosophers. 13 Aug 1818, p.2. VA, USA

Teed, Cyrus (1899) The Illumination of Koresh: Marvelous Experiences of the Great Alchemist Thirty Years Ago, at Utica, NY. Guiding Star, Chicago, USA.

Goodricke-Clarke, Nicholas (2004) The Occult Roots of Nazism: Secret Aryan Cults and their Influence on Nazi Ideology. Tauris Parke Paperbacks, NY, USA.

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The Dark Histories Butterfly was drawn by Courtney, who you can find on Instagram @bewildereye

Music was recorded by me © Ben Cutmore 2017

Other Outro music was Paul Whiteman & his orchestra with Mildred Bailey - All of me (1931). It's out of copyright now, but if you're interested, that was that.