Cooper Nuclear Station: Triangular UFO Over Reactor (1986-1989)
Security personnel at a Nebraska nuclear facility observed a triangular craft with rotating lights hovering over the reactor building on two consecutive nights between 1986 and 1989. The object moved silently along the Missouri River before entering restricted airspace.
Background
Between 1986 and 1989, a security guard stationed at Cooper Nuclear Station witnessed an anomalous aerial phenomenon during night shifts at the facility's intake structure. The craft approached from the Missouri River at approximately 150 feet altitude, hovering near the water intake before departing upstream.
The following evening, the same guard observed the return of the object, which on this occasion penetrated the facility's protected area. The craft positioned itself above the reactor building, displaying a triangular configuration with circular rotating lights underneath. Witnesses estimated its size at roughly one-third of the reactor building's dimensions. The absence of audible propulsion distinguished the object from conventional aircraft.
Multiple security officers confirmed the second sighting after being alerted from the break room. Despite these observations, colleagues initially expressed skepticism toward the reports. The incident was later documented by the Nuclear Regulatory Commission and transmitted to facility management in 2010 with instructions to restrict information to personnel on a need-to-know basis.