On April 6, 1966, more than 200 students and teachers at two Melbourne schools watched a silver, domed disc descend into a field near Westall High School. The object left flattened grass circles, and witnesses were later warned by uniformed officials not to speak about what they had seen.

At approximately 11:00 a.m. students from Westall High School and the adjacent state primary school observed the object for roughly twenty minutes. Science teacher Andrew Greenwood described the craft as silver-grey and disc-shaped. RAAF personnel visited the site days later. The Dandenong Journal covered the story on its front page on April 14 and 21, 1966, and was the only outlet to obtain teacher testimony before the school silenced further statements.