It's a metallica object shaped like a bell, hence the code name "Die Glocke" / The Bell. It stood 12-15 ft. tall, 9 ft. in diameter and comprised of two counter-rotating cylinders that rotated a highly radioactive substance code named "Xerum 525" (purplish liquid metal).
It is said that all the scientists and witnesses who saw or worked on the Bell were murdered by the SS to conceal any knowledge of the secret program.
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