In the late 1980s, thousands of Belgians began reporting strange sightings in the skies over their otherwise stable country: large triangular unidentifiable flying objects. Nobody knew for sure what they were. To solve the mystery, a civil investigation group started working together with the authorities, counting on the support of the gendarmerie and the Belgian Air Force. Thirty years later, the Belgian UFO wave still lives in the minds of witnesses and onlookers from the era, some of whom are still searching for answers today. What on earth was going on in the skies over Belgium?