CARLOS.
“Beginning in early 1981, Mexican photographer Carlos Diaz claimed a series of close encounters with orange, glowing, oval craft near Tepoztlán in the state of Morelos.”
Mexican investigator Jaime Maussan and German investigator Michael Hesemann publicly endorsed the case and helped distribute Diaz's footage. Hesemann's Cosmic Connection: Worldwide Evidence for Extraterrestrial Contact (1996) presents the case favourably. Both researchers performed photographic analyses they argued were consistent with large luminous objects at substantial distance.
Skeptical analyses, including those by photographic analyst Maurizio Verga and by the Italian Centro Italiano Studi Ufologici, concluded that several Diaz images and videos were consistent with hand-held or near-camera light sources and showed inconsistencies in scale, parallax and shadow geometry. No independent witness corroboration of the more spectacular contact claims has emerged.
The Carlos Diaz case is included here because it is one of the most-cited examples in the broader Mexican UFO wave of the 1990s — the period that also produced the July 11, 1991 mass sighting during the total solar eclipse over Mexico City. That eclipse-day event was independently filmed by many separate observers and remains a significant mass sighting in its own right. Diaz's individual claims, by contrast, should be treated as contested testimony with mixed analytical support and not as established physical evidence.