Overview
A 1978 account from El Vellón, Spain, describes an unidentified man known as “Señor X” who claimed to be extraterrestrial and said an underwater UFO installation existed in the El Vellón reservoir, north of Madrid. The reservoir is now commonly known as the Pedrezuela Reservoir. According to material published by Alien Archivist on Nov. 12, 2026, the claim received attention from Spanish media after Señor X contacted Radio Intercontinental in Madrid.
The episode remains an unverified historical UFO report. No independent evidence confirming the man’s identity, his alleged extraterrestrial origin or the existence of any underwater facility is provided in the source material.
The 1978 Interview
The Spanish newspaper Pueblo reportedly published an interview with Señor X on Nov. 11, 1978. The meeting was arranged with assistance from Rafael Herrera of Radio Intercontinental, who introduced or connected the unidentified claimant with journalist Pablo Torres.
A photograph attributed to Ángel Molleda shows the three men during the meeting. Señor X is seated with his back to the camera, apparently to conceal his identity, while Torres and Herrera face him. The image is presented as documentation of the interview, but it does not independently establish who the man was or substantiate the claims he made.
According to the account, Señor X told the journalists that the El Vellón reservoir contained an extraterrestrial base. He also allegedly discussed extraterrestrial civilizations, time travel and a coming global catastrophe. The report characterizes his statements as including a prediction that the end of the world was imminent—an event he reportedly described as positive rather than threatening.
Claims of 152 Additional Bases
The most expansive part of the story concerned the alleged number of installations. A quoted passage from the reported coverage states: “He also claims that there are another 152 underwater extraterrestrial bases in Spain.” In this formulation, the El Vellón site would be one base, with 152 additional locations bringing the total to 153.
The distinction is important because some retellings describe Señor X as claiming 152 bases in total, while the source material presents the figure as 152 bases in addition to the El Vellón installation. The available account does not identify the locations of the alleged bases, describe their construction or provide technical evidence that they existed.
Search and Unresolved Questions
Señor X’s statements reportedly attracted newspaper attention and prompted an organized search of the reservoir. However, the supplied material does not provide operational details about the search, identify the individuals or authorities involved, or report the discovery of structures, vehicles or other physical evidence.
The case therefore rests primarily on the reported interview and the accompanying photograph. There is no independent verification of the claimant’s identity or of the alleged underwater bases. It is also unclear from the available material whether Señor X was ever identified after the interview, whether additional contemporary newspapers investigated the claims, or what conclusions participants in the search reached.
Historical Context
The El Vellón account reflects a period when UFO stories frequently moved between radio, newspapers and public investigations, often combining reports of unusual craft with broader claims about extraterrestrial civilizations and impending disasters. Such reports can be valuable for documenting the cultural history of UFO beliefs, but they require careful separation between what was reported at the time and what has been demonstrated.
In this case, the documented element is that a man using the name “Señor X” was reportedly interviewed in 1978 and photographed anonymously. His claims about 153 underwater UFO bases in Spain remain allegations rather than established facts.
