At approximately 11.00 am on Wednesday, 6 April 1966, a class of students and a teacher from Westall High School (now Westall Secondary College) were just completing sports on the main oval when an object, described as being a grey saucer shaped craft with a slight purple hue and being about twice the size of a family car, was alleged to have been seen. Witness descriptions were mixed: Andrew Greenwood, a science teacher, told The Dandenong Journal at the time that he saw a silvery-green disc.
According to witnesses the object was descending and then crossed and overflew the high school’s south-west corner, going in a south-easterly direction, before disappearing from sight as it descended behind a stand of trees and into a paddock at The Grange in front of the Westall State School (primary students). After a short period (approximately 20 minutes) the object – with witnesses now numbering over 200 – then climbed at speed and departed towards the north-west. As the object gained altitude some accounts describe it as having been pursued from the scene by five unidentified aircraft which circled the object.