Case file · Secret facility (alleged)
Die Glocke, the Nazi 'Bell'
Polish author Igor Witkowski claimed in 2000 that the Nazis tested a bell-shaped anti-gravity or exotic-energy device near the Wenceslaus mine in Lower Silesia, citing an interrogation record he said he had seen.
2000 CE · 50.62, 16.49 · status: claim
The account
Witkowski linked it to a concrete ring nicknamed 'the Henge', supposedly used to tether the Bell during tests. Nick Cook's 'The Hunt for Zero Point' (2001) brought the story to English readers, and writers such as Joseph Farrell tied it to UFOs, time travel and the Kecksburg crash.
The sceptical view
The only source is a third-hand claim about a document nobody else has produced; the 'Henge' matches the base of an ordinary industrial cooling tower.