On April 6, 1966, over 200 people at a Westall, Australia school witnessed a silver, disc-shaped object rapidly maneuvering in the sky. The craft, allegedly pursued by light aircraft, descended into a reserve and left a flattened circle of scorched grass. Authorities quickly initiated a cover-up, silencing witnesses. Despite theories proposing it was an errant radiation-testing balloon or military test, the mass UFO sighting remains an unsolved mystery.