Spain.Montánchez · the object no aircraft could reach

On the afternoon of 3 June 1967, a T-33 jet trainer of the Talavera la Real Jet School, callsign Duende 20, with two captains aboard, was flying from Torrejón to its base. It had taken off at 15:55 universal time. On reaching the overhead of Montánchez, at flight level 220, the pilots saw at eleven o'clock a very bright object well above them. They reported it to the Matador alert and control squadron, which asked the operations centre for permission to attempt an interception and got it. The pilots climbed towards the object but could not reach it: they had the impression it was rising as they rose. That is how it was recorded on the magnetic tape of the conversation, which the file transcribes: 'it is stationary… it looks like a white, bright balloon', and later, 'the higher I climb, the higher it gets'. Twice they noticed strong radio interference when passing beneath it.

The pilots described a shape that changed with the angle: first rounded, at 16:37 triangular, with the side facing away from the Sun brighter. At 16:26 a second alert and control squadron, Bolero, picked up on its radar an object that seemed to be orbiting over the Talavera area; since the T-33 was in contact with Matador, it only listened. At 16:45 Matador's radar also had it, with a double echo on the height display. The controller estimated it at about 50,000 feet. At 16:59, with the T-33 short of fuel, a pair of F-86F fighters from Torrejón, callsign EL-01, carrying cameras, was ordered up. They made visual contact at 17:24; one climbed to 30,000 feet and the other to 42,000, and they tried to intercept for about twenty minutes without being able to close on an object that, according to their reports, kept gaining height. They took photographs; the file keeps only one very poor-quality print showing a point of light. All three aircraft returned for lack of fuel.

On 8 June the Air Defence Command sent the Air Staff a report with the statements of the Matador and Bolero commanders, the track records from both radars, the tape transcript, the F-86 pilots' reports and the photograph; on 14 June it added the report of the two T-33 captains and a clipping from Badajoz's 'Hoja del Lunes', which had published the sighting on the 5th. Its conclusions were cautious: the real existence of a strange object in Badajoz airspace, which none of the pilots could identify; that all three aircraft always flew below it without reaching its height; differing views on its shape, which seemed to change with the observer's position; and very slow or no horizontal movement over a long period. In 1992, when preparing its declassification, the Air Operations Command summarised the case on a record sheet. It notes that pilots and controllers agreed on the possibility of a balloon, though at times they thought not because of the brightness of the side away from the Sun, and adds a consideration: the double radar detection made the presence of a solid physical object, with very slow horizontal movement, undeniable. In the recorded conversation, the controller himself ends up calling it 'the balloon'.

Montánchez is one of the most complete Spanish files and one of the most instructive in the corpus, because it combines everything that usually raises a case to the top level —military pilots, two radars, fighters sent up with cameras, a recorded tape, an air command's report— and, at the same time, almost everything that points to a conventional explanation. A bright object that stays almost motionless for over an hour, far above the ceiling of a T-33 and an F-86, that seems to climb when the aircraft climb, whose shape changes with the angle of the Sun and that radar places at about 50,000 feet is the portrait of a stratospheric research balloon, of the kind being launched in Europe in those years. The pilots and controllers themselves said so on the frequency.

The case teaches how to read the file's most quoted sentence carefully. 'The double radar detection makes the presence of a solid physical object undeniable' is correct, and it is exactly what one would expect of a large balloon with its payload: a real, slow, high object that reflects radar. Undeniable does not mean anomalous. The illusion that the object rises as the aircraft rises is typical of balloon chases, because a climbing pilot always sees the target above him until he reaches its altitude. Some details remain without a closed explanation —the radio interference, the change of shape—, which wind, the geometry of sunlight and the balloon's own payload may explain, but which the file does not resolve.

That is why the case enters at level S for the quality of its documentation and with a partition clearly tilted towards the misidentification of a balloon. It is also a good portrait of Spanish air defence in the 1960s: rapid reaction, a complete chain of command, a real interception attempt and a report that, without naming the balloon, leaves it written on the tape. The Ministry of Defence collection publishes it in full, under an open licence, which lets readers read the transcript and judge for themselves.