Skyquakes, Upsweeps, Bloops and Sky Trumpets | Terrifying Sounds that Signal the End of the World

The Book of Revelation says the end of the world will be announced with the sound of seven trumpets. Each blowing of the trumpet brings a new apocalyptic event. After the seventh trumpet: armageddon. For centuries, people have reported low-frequency hums, the crack of thunder on a clear day and the…