It’s a mystery that has haunted eyewitnesses for half a century.
For students and teachers at Westall State School and Westall High School, 6 April 1966 started out like any other day.
Then, suddenly, eyewitnesses say they saw three metallic discs moving quickly through the sky.
They remember the strange objects landing in a paddock near the schools before taking off, never to be seen again.
In 2014, government documents were released that revealed a secret radiation-testing program.
Many people now believe the “flying saucers” were silver-coloured high altitude balloons monitoring radiation levels that had gone off course.
We may never know the answer for certain – the paperwork for the launches the day before the sighting are missing.