Unveiling the Enigmatic Aura of Finland's 'Devil Church': Scientists Unravel the Eerie Resonance

The Pirunkirkko cave in Finland, also known as the Devil's Church, has gained a reputation for its alleged contact with the spirit world. Researchers from the University of Eastern Finland have discovered that the cave has a unique resonance caused by a standing wave between its smooth parallel walls. This resonance amplifies and lengthens sounds at specific frequencies, creating a tone at 231 Hz that stays audible for about one second. Visitors claim to feel the presence of a spirit due to this subtle resonance, which is rare in natural environments.