uncertaintimes:

Depiction of alleged configuration of Die Glocke

Die Glocke (German for “The Bell”) is the name of a purported top secret Nazi scientific technological device. The only source for this is the books of Polish aerospace defence journalist and military historian Igor Witkowski, which claim it to be a secret weapon, or Wunderwaffe. The topic has been popularized by Nick Cook, Joseph P. Farrell and conspiracy theory websites, associating it with Nazi occultism and antigravity or free energy research…

The device is described as metallic, approximately 9 feet wide and 12 to 15 feet high with a shape similar to a bell. It contained two counter-rotating cylinders filled with a substance similar to Mercury that glowed violet when activated, known only as Xerum 525, it has been speculated to be Red mercury. When active, The Bell would emit strong radiation, which led to the death of several scientists and various plant and animal test subjects…

Farrell states:

The Bell was considered so important to the Nazis that they killed 60 scientists that worked on the project and buried them in a mass grave and the only reason we know about the Bell is that the SS General that was tasked with the murders, Jakob Sporrenberg, was tried after the war by a Polish War Crimes court for murdering his own people on what subsequently became Polish soil. So it’s his Affidavit that gives us the story of the Bell.

What might have happened to The Bell, had it existed, were it to have been evacuated out of Germany is unknown, however there has been some speculation: Witkowski speculated that it ended up in a Nazi-friendly South American country, Cook speculated that it ended up in the United States as part of a deal made with SS General Hans Kammler and Farrell speculated that it did not reach the United States until it was recovered in the Kecksburg UFO incident. (Others have speculated that it ended up in the secret Nazi base in Neu Schwabenland, Antarctica.)