On the night of 2 January 1975, personnel guarding the Bardenas Reales firing range in Navarra reported two successive displays of moving lights. Their statements prompted interviews, a search for traces, a radar inquiry and a check on French balloon launches. The released file preserves disagreement within the investigation: officers who accepted that something unusual had been observed and a regional commander who proposed ordinary lights viewed through intermittent mist.
The case is documented in Spanish Air Force expediente 750102, now held by the Biblioteca Virtual de Defensa. Its thirty scanned pages include repeated copies of witness statements, a comparison table, a trajectory sketch, correspondence and the commander's explicitly personal interpretation. It is a record of an investigation, rather than a single agreed identification. The reported movements and estimates should remain attributed to their observers.
A red light mistaken initially for a vehicle
The retrospective summary places the first observation at about 22:55. A soldier outside the main tower noticed an intense stationary red light and called the corporal of the guard. Three more soldiers joined them. Their initial thought was a vehicle within the range; one statement specifically mentions a tractor. That starting interpretation matters because the witnesses did not describe recognising an unfamiliar aircraft immediately.
The corporal estimated the light to be between two and five kilometres away. After several minutes, it appeared to rise and move towards the auxiliary tower. The reported height was generally put between twenty-five and fifty metres, using features of the terrain as references. The light then appeared to change direction towards the main tower, increase its height and speed, and disappear towards the north or northwest.
Most of these observers could not distinguish a shape or reliable size. They described a stronger and a weaker red light, sometimes intermittently visible. The distinction between two visible lights and a measured solid object is important: the statements provide a sequence of impressions against familiar landmarks, without independent tracking of a physical body.
The second observation and the binocular account
Around 23:10, the corporal telephoned the duty staff to report the disturbance. A first sergeant took binoculars to a mound behind the garages. He described what looked like an inverted cup, with white lights above and below and white and amber lights at its sides. He compared its apparent dimensions with a truck, while acknowledging that he could not specify its size precisely.
The five men near the tower also described a second, predominantly white light. They placed its initial appearance in roughly the same area as the earlier red display. It seemed to remain still, rise and follow part of the previous route before departing rapidly, usually described as towards the northeast. Some statements say the white illumination made the ground easier to see.
The distinctive inverted-cup form belongs to the binocular observer's account. It should not be assigned to all six witnesses. The naked-eye observers repeatedly said they could not give a shape or size. Their estimates of duration also differ: several describe only minutes, while the sergeant's statement gives a longer interval whose clock times do not fit neatly together. The summary recognises that no one timed the events with a stopwatch.
What the first inquiries accepted
The lieutenant's report dated 9 January considered the men to have seen something strange in its movements and characteristics. It noted that the patrol was highly excited: the men had loaded and cocked their weapons and said they were ready to use them if the objects came closer. The telephone operator likewise recalled their agitated speech. The record establishes their reported reaction, rather than a shot being fired or a weapon effect on an object.
A separate investigating officer's report dated 8 January emphasised that witnesses had been questioned individually and that their accounts agreed. The comparison table and statements do support a shared broad sequence, but also retain differences in timing, visibility and direction. Preserving those differences gives a more accurate account than treating the report's assertion of exact agreement as a literal description of every answer.
The men had been on duty since the morning. The lieutenant recorded their long period of service, the food and drink reported, the darkness and the visibility of surrounding hills. These were circumstances assessed during the inquiry. They do not justify a retrospective medical diagnosis or an unsupported claim that the witnesses were intoxicated.
Searches, communications and the radar question
The range commander's account says that when he looked after approximately 23:30 he saw nothing abnormal. He noticed mist in part of the range and the Moon becoming visible as it dispersed. He had not witnessed the earlier sequence described by the patrol. His later view of the conditions therefore provides relevant context, without directly reproducing everything the other men said they saw.
An inspection of the place where the objects were supposed to have been on or near the ground found no remains or marks establishing their presence. The inquiry also consulted the warning-and-control unit. Its operations staff reported no corresponding unidentified radar echo. That negative response is not radar confirmation of the visual account, and it cannot establish a precise flight path.
There was no reported unusual sound. The lieutenant also recorded no apparent electromagnetic disturbance: telephones worked, radio listeners noticed no interference, and the sergeant had not noticed anything abnormal on the television before being called. These observations limit later embellishments involving disabled equipment. Silence and functioning instruments were features of this file, not proof of an exotic propulsion system.
The regional commander's alternative explanation
The document numbered 0023, dated 11 January 1975, labels itself the regional commander's personal interpretation. It accepts that the witnesses firmly believed they had seen flying objects, but disputes that the available evidence warrants an actual overflight or landing. It stresses the absence of sound, air disturbance and radar returns, alongside differences in descriptions of the weather.
The commander suggested light from the Moon, a star or a nearby tractor passing through layers of mist, producing an apparent moving illuminated body. Those are proposed causes, not a demonstrated reconstruction identifying one lamp or one celestial object. The disagreement is consequently narrower than a choice between confirmed alien craft and a fully reproduced optical event: the file records sincere reports and an ordinary-light hypothesis whose exact stimulus was not established there.
A separate line of inquiry concerned the French balloon centre at Aire-sur-l'Adour. The reply reproduced in the file states that no sounding balloon had been launched there from December 1974 through 7 January 1975; its last launch was on 15 November. This eliminates that particular suggested launch source for the requested period. It does not eliminate every possible balloon everywhere or validate the witnesses' distance estimates.
Release, location and the surviving evidence
The catalogue dates declassification to 13 July 1994. The review's conclusion that there was no reason to retain classified status is an administrative release decision, separate from the competing 1975 interpretations. Its later appearance in a public digital library should not be confused with a new sighting or a new official finding about the object's identity.
Approximate map area: the pin at 42.20°N, 1.48°W represents the Bardenas military-range area, rounded from the geographical context and boundary coordinates in Royal Decree 1943/2000. It is not a surveyed witness position, a landing point or permission to enter military land. The article gives no directions into the range. Coordinate source.
The surviving evidence is strongest for what the guard personnel reported and for how military investigators tested it. It is weaker for absolute size, speed and distance. The two phases, the single binocular shape account, the negative trace and radar checks and the commander's mist hypothesis all belong together. Removing any one of those elements produces a simpler story than the released dossier supports.
Source trail: Biblioteca Virtual de Defensa, expediente 750102, physical PDF pages 2–30, particularly the witness statements, investigating reports, document 0023 and the French balloon correspondence. The linked lead image reproduces document 0023 under the library's stated CC BY 4.0 licence. Related reading: UFO / UAP / USO. Sources checked 10 November 2026.