Die Glocke (, German for "The Bell") was a purported top secret Nazi scientific technological device, secret weapon, or Wunderwaffe. First described by Polish journalist and author Igor Witkowski in Prawda o Wunderwaffe (2000), it was later popularized by military journalist and author Nick Cook as well as by writers such as Joseph P. Farrell and others who associate it with Nazi occultism and antigravity or free energy research.