The Westall UFO

Summary

On the morning of 6 April 1966, pupils and teachers at Westall High School in Melbourne reported a silvery object in the sky, circled by light aircraft, and flattened grass in a nearby paddock. Two balloons and a towed target have been proposed as the cause, and no record places any of them over Westall.

The ABC has called it the largest mass UFO sighting in Australian history. The record from 1966 and 1967 is short: a handful of newspaper reports, a letter, a UFO society's report form, a pupil's written account and a teacher's interview with an American scientist. Most of what is now told comes from interviews given decades later.

What is documented

The morning. 6 April 1966 was a Wednesday. A report form filed the next day with the Victorian Flying Saucer Research Society gives the time as 10.20 am, during the morning break. The Age reported on 7 April: "Hundreds of children and a number of teachers at Westall School, Clayton, watched the object during morning break."

The first explanation. The same Age report, headlined "Object perhaps balloon", said the Weather Bureau had released a balloon at Laverton at 8.30 am and that the westerly wind "could have moved it into the area where the sighting was reported." Laverton is about 33 kilometres west-north-west of the school.

The local paper. On 14 April The Dandenong Journal described "a round humped object with a flat base being circled by what appeared to be light aircraft". It said that several children and at least one staff member were reported to have seen it, and that inquiries had been hampered by "the reluctance of school authorities to permit interviews". On 21 April, under the headline "Flying Saucer Mystery Deepens: Who were 5 pilots?", it quoted a science teacher, Andrew Greenwood, describing the object the aircraft were chasing as "Like a thin beam of light, about half the length of a light aircraft." It added that all attempts to trace the aircraft or their pilots had failed.

Other accounts of 1966 and 1967. The flying saucer society's form records two circular objects, "Round on top Flat on bottom", silver, seen for 15 minutes, and "Flattened waist high grass for 10 yds diameter". A pupil's account printed that year in the Westall Clayton Calendar describes "a silvery object as long as one of the Cessnas, but very thin", and grass crushed flat over an area 25 to 30 feet (about 8 to 9 metres) across. On 28 June 1967 the American atmospheric physicist James E. McDonald interviewed Greenwood. His notes record an object "cigar shaped, elliptical, but at times it 'bulged' in the middle", about two-thirds the size of a Cessna, watched for about 15 minutes at 500 to 1,000 yards while it played "cat and mouse" with the aircraft. Moorabbin Airport, about 5 kilometres from the school, said no aircraft had been up. The headmaster told Greenwood that an Air Force officer had come to the school but had not been allowed to interview him because he was teaching.

The letter. On 28 April 1966 The Dandenong Journal printed a letter from a writer signing himself a former RAAF navigator. He wrote that one of the "saucers" had been "correctly identified as a meteorological radiosonde balloon", and that the teacher's description was "a reasonably accurate description of a target drogue towed by one aircraft": a fabric sleeve like a windsock, silver-grey, about half the length of a light aircraft.

No official record. No Australian government file on the event has been found. Keith Basterfield, a researcher who compiled the 1966 documents and searched for official ones, wrote in 2017 that years of looking had been unsuccessful.

The later testimony. Most of the detail now told comes from interviews given decades later, many of them collected by the researcher Shane Ryan, who has located 142 people who saw an object or objects and 197 who saw the ground marks, according to the ABC. Accounts published in 1996, in Bill Chalker's The Oz Files, describe military personnel examining the flattened grass with radiation detectors and the paddock later burnt out. Former pupils have said they were told at a school assembly not to discuss what they saw, and that men they did not know questioned some of them. In a recorded interview broadcast by the ABC in April 2026, Greenwood, who has since died, said he was told he would be prosecuted and had to keep quiet. The City of Kingston has built a flying-saucer playground at the Grange Reserve to reflect the incident.

The HIBAL hypothesis. HIBAL was a US and Australian programme that flew high-altitude balloons from Mildura, in north-west Victoria, and other Australian sites to measure radioactivity in the stratosphere. In April 2014 Basterfield proposed that a HIBAL payload, which came down under a parachute about 12 metres across, could account for the sighting. In 2017 he found a US Health and Safety Laboratory fallout report, dated 1 January 1968, listing a HIBAL launch on 5 April 1966, the day before; he identifies it as flight 292, which reached 27,000 metres. Mildura is about 495 kilometres north-west of Westall. Basterfield states that no document shows the flight came near Westall, and that a Department of Supply file series was destroyed by the Department of Defence in 1996, leaving him no way to test the idea. In April 2026 John Sutcliffe, who worked on the Mildura HIBAL team in 1966, told the ABC: "As far as I'm aware, and I'm probably nearly 100 per cent, there was no HIBAL balloon involved in Westall."

Leading explanations

A Weather Bureau radiosonde balloon (suggested by The Age on 7 April 1966; supported by Brian Dunning in 2010 and by Richard Saunders of Australian Skeptics in 2026; untested). It was released 33 kilometres away less than two hours before the sighting. The Age said the wind was westerly; Shane Ryan says the day's wind data show it blowing from the south-west, which would have taken the balloon further north. No tracking record has been published. Dunning offers it only for the first part of the sighting, a disc hovering and descending behind the trees.

A target drogue towed by one of the aircraft (the former navigator's letter of 28 April 1966, revived by Dunning in 2010; untested). The letter's writer matched it to the teacher's 1966 description of a thin, silvery object about half the length of a light aircraft; Dunning adds the "cat and mouse" movement Greenwood described to McDonald. The Dandenong Journal could not trace the aircraft or their pilots, and no record of a towing flight has been published.

A HIBAL balloon payload (Keith Basterfield, 2014; untested and disputed). The launch on 5 April 1966 is documented. Nothing places the flight near Westall, a Department of Supply file series was destroyed in 1996, Shane Ryan does not support it, and a member of the 1966 launch team says that, as far as he is aware, no HIBAL balloon was involved.

Memory and social contagion (Saunders and Dunning; an account of how the later testimony may have grown, not of what was seen). The detailed testimony was collected decades after the event, by which time the story was well known.

An unidentified craft or a secret project (the view of many witnesses; a secret US project was suggested by the military historian Neil Smith in 2026; no supporting documents).

Current status

Unsolved. Three ordinary candidates exist: one proposed the next day, one three weeks later and one in 2014. None has been tested against a record that places it over Westall at 10.20 am. The case rests on a few documents from 1966 and 1967 and on testimony collected decades later, and the two do not always agree.

The 60th anniversary in April 2026 brought new interviews and a denial from a member of the HIBAL team, but no new documents. Tracking data for the Laverton balloon or the Mildura flight, records identifying the five light aircraft, or a government file on the event would change this entry.

Last reviewed: September 2026. Records are provisional. Where the evidence changes, the entry changes. Found an error? Tell us.