and the final confirmed lock took place at 00:40. Following several further unconfirmed contacts, the F-16s eventually returned to base shortly after 01:00. Members of the Wavre gendarmerie who had been sent to confirm the original report, describe four lights now being arranged in a square formation, all making short jerky movements, before gradually losing their luminosity and disappearing in four separate directions at around 01:30. They also reported that a low engine noise was heard and that it seemed to have a stick coming out one end with a turbine on it, which has led many to conclude the object was a helicopter. "Patrick M." hoax photograph In April 1990, a hoax photo of a triangular object upon which three lights are visible at each corner was taken by an anonymous photographer. Since then, a man named Patrick M. has publicly admitted to creating the hoax "UFO" photograph. Experts say there is no background in the photograph and no element that would allow calculation of the object's size or distance from the camera. Wim van Utrecht has reproduced a copy of the photograph with devices. A computer graphics simulation method to reproduce the photograph was developed by a Belgian mathematician, Thierry Veyt at The University of Liège Laboratory of Astrophysics, wherein the apparent "shake" motion, that results in the lights of the craft appearing blurred or out of focus in the photograph contradicts eye-witness statements. This, along with the anonymity of the photographer and fact that the image was not produced publicly until 4 months after the alleged event, also brought the authenticity of the image into question. For 20 years, the ufological organization Société belge d'étude des phénomènes spatiaux (SOBEPS) claimed that this picture was genuine. But on 26 July 2011, in an interview for RTL, a Belgian TV channel, Patrick M. explained that it was a hoax. In his 27 September 2016, Skeptoid podcast episode titled "The Belgian UFO Wave," author Brian Dunning discussed the photographic evidence and said that the single photograph is emblematic of the quality of all the evidence that characterized the Belgian UFO wave. In 2011, Patrick Maréchal demonstrated how he had created the hoax UFO, by cuttting a piece of styrofoam into a triangle, painting it black, embedding a flashlight in each corner, and hanging it from a string. Explanations In 1992, about three years after the first sighting, which occurred on