UMMO correspondence and associated Spanish sightings

The UMMO affair began in Madrid as a correspondence mystery and grew into a sprawling contact narrative involving letters, telephone calls, alleged landings, photographs, and a fully described extraterrestrial society. It should not be treated as one uninterrupted encounter. The early recipients gathered around Fernando Sesma Manzano, who led discussions at the La Ballena Alegre café. Beginning in 1966, Sesma and other Spaniards received long typewritten documents whose authors claimed to be visitors from a planet called UMMO. The pages carried a distinctive emblem: three vertical strokes crossed by a horizontal line, with the outer strokes curving away at the top. The letters described Ummite science, language, social organization, technology, and the supposed activities of observers living secretly on Earth. One document identified Sesma and framed the correspondence as controlled contact. Another connected the writers retrospectively to a reported landing at Aluche, outside Madrid, on February 6, 1966. In that event José Luis Jordán Peña said he saw a large circular craft with three landing supports and the same UMMO emblem on its underside. Reports also described impressions in the ground and electromagnetic effects. Those physical-sighting claims and the letters came from related participants; they cannot be counted automatically as independent corroboration. The affair gained its most famous visual evidence on June 1, 1967, at San José de Valderas. Witness reports and five photographs showed a dark disc carrying the UMMO symbol. The pictures were delivered anonymously and were widely reproduced. To supporters, the match between the emblem on the craft and the letters made the case unusually persuasive. Later photographic analyses argued that the object was a small model suspended on a thin line. The photographs remain historically important, but the Atlas does not display them as verified spacecraft imagery. UMMO continued for decades. Hundreds of documents circulated in Spain, France, and other countries, accumulating a technical and philosophical mythology far larger than the original Madrid events. In the early 1990s Jordán Peña acknowledged creating the enterprise as a social experiment and described writing documents, disguising telephone voices, and using a suspended model for photographs. His explanations and the proposed involvement of occasional collaborators did not resolve every document to everyone's satisfaction, so some adherents continued to argue that parts of the corpus had another origin. The evidentiary structure is nevertheless clear. The letters prove that an elaborate anonymous correspondence campaign existed. The photographs prove that model-like images bearing the emblem circulated. They do not prove the authors were extraterrestrial. The Atlas therefore preserves UMMO as an influential contact and hoax-history case, separating the Aluche report, San José photographs, correspondence corpus, and later confession rather than blending them into a single confirmed visitation.