It is the purpose of this book to present scientific evidence to prove that the Earth, rather than being a solid sphere with a fiery center of molten metal, as generally supposed, is really hollow, with openings at its poles. Also, in its hollow interior exists an advanced civilization which is the creator of the flying saucers.

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Quote text and notes from Wikiquote: Walter Siegmeister (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.