Cergy-Pontoise Disappearance (1979)

The reported event

In the night of 25–26 November 1979, Franck Fontaine, 19, was alone in his car at Cergy-Pontoise, a town north-west of Paris in the Val-d'Oise. His two friends, Jean-Pierre Prévost and Salomon Ndiaye, had seen a glowing light and left to fetch a camera. According to the account published by Paris Zigzag, Fontaine said the car stopped as if by magic, its doors locked, and a glowing mass settled on the hood before everything went blank. When the friends returned, he was gone.

The friends described small spheres circling the car, which then departed in a cigar-shaped light. Fontaine reappeared at the same spot about a week later, on 2 December 1979 by Paris Zigzag's account (other reports give 3 December), wearing the same clothes and still carrying 100 francs. He said only that he had been in a trou noir, a black hole.

Investigation

Police doubted the story and looked for earthly explanations, such as a flight or a crime. They searched about two hectares of fields for eight days and found nothing. Press coverage was heavy, and Sud Ouest's contemporary coverage recorded that officers and gendarmes were skeptical, noting that the witnesses seemed of sound mind when questioned.

The case reached the desk of the Centre National d'Études Spatiales (CNES), which at the time housed GEPAN, the Groupe d'Études des Phénomènes Aérospatiaux Non Identifiés, based in Toulouse since 1977 and designed to receive mainly gendarmerie reports, photographs and testimony. Its report, titled À propos d'une disparition ('About a disappearance'), ran to roughly a hundred coded pages. According to Sud Ouest's June 1980 article, the names had been changed but the date and facts left the case identifiable, and the report concluded that the abduction claim was a fabrication. A Fox News report adds that investigators tested Fontaine's blood for signs of recent weightlessness and found none.

Aftermath and admission

Fontaine went on to speak at conferences and write articles, and in August 1980 announced that extraterrestrials would land the next day in a tunnel in the Jura. About two thousand people gathered there; nothing happened. Years later, on Radio Korrigans, Jean-Pierre Prévost reportedly said of the affair: "L'affaire de Cergy, c'est bidon. J'ai tout inventé" ('the Cergy affair is a fake. I made it all up'), as reported by Paris Zigzag.

Why it matters

Cergy-Pontoise is a frequently cited French case in which official UFO investigators reached a published finding of fabrication. It is often cited in discussions of how state UFO units handled hoaxes and of the limits of the 'abduction' category: the story was built from a single witness's account, a few hours of blankness, and the friends' ambiguous testimony. It is also a reminder that GEPAN's archive, which the French space agency began publishing online, contains cases investigators themselves judged to be false.

The case is best treated as a documented hoax rather than an open anomaly. The available reporting is mostly press and secondary, and the full report text has not been checked here.