InThe Truth About The Wunderwaffe (2003), originally published in Polish as Prawda o Wunderwaffe (2000), Witkowski claims to have discovered the existence of the alleged German secret project Die Glocke from transcripts of an interrogation by Polish authorities of former Nazi officer Jakob Sporrenberg.
Sporrenberg has since been linked to the alleged German secret project Die Glocke (The Bell) by Polish writer Igor Witkowski, who claimed to have discovered the existence of Die Glocke from transcripts of an interrogation by Polish authorities of Sporrenberg.
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A description of Die Glocke, based on Witkowski's account, is also presented in The Hunt for Zero Point: Inside the Classified World of Antigravity Technology by British author Nick Cook.