Revealed hoaxThe UMMO Affair (Spain, 1965-1996)

From the mid-1960s, contactee Fernando Sesma’s Madrid circle began receiving anonymous typewritten ‘UMMO’ documents - eventually thousands of pages of pseudo-scientific cosmology, genetics, and social philosophy from aliens (‘Ummites’) of planet UMMO orbiting star IUMMA (suggested = Wolf 424), signed with a distinctive ‘)+(’ symbol. Staged sightings and photos reinforced the letters: an Aluche (Madrid) tripod-craft report in February 1966 (witnessed by Jordan Pena himself) and the San Jose de Valderas disc photos of 1 June 1967, with a symbol-stamped cylinder ‘found’ at the site. Spain’s INTA lab analyzed the materials (1968) and found them fraudulent; Antonio Ribera and Rafael Farriols nonetheless launched the mythology into mainstream Spanish/French ufology with ‘Un caso perfecto’ (1969). The decisive resolution came in 1993, when psychologist Jose Luis Jordan Pena confessed in print (‘Ummo: otro mito que hace crash’) to authoring the letters and staging the Aluche marks and the 1967 photos, calling it an ‘immoral experiment.’ An internal tell independently betrays the hoax: the early letters used an obsolete 1938 Wolf-424 distance that Yerkes had retracted in 1952. Spain’s most famous UFO case and a textbook of manufactured belief - a self-sustaining ET mythology built almost entirely from fabricated documents.