Documented sightings reported in 1989.
Over 13,500 witnesses across Belgium reported massive silent triangular craft, confirmed by police, radar, and Belgian Air Force F-16 intercepts.
Bob Lazar claimed to have reverse-engineered alien propulsion at 'S-4' near Area 51, describing Element 115 fuel years before its synthesis.
Multiple witnesses in Voronezh reported a landed craft with tall beings and a robot, reported by official Soviet news agency TASS.