TRANS-EN-PROVENCE.
“On the afternoon of January 8, 1981, retired technician Renato Nicolaï was working on his property in the village of Trans-en-Provence in the south of France when he heard a faint whistling sound.”
Nicolaï reported the event to the local gendarmerie, who arrived the following day, took photographs and collected soil and plant samples from the alleged landing area. The samples were forwarded to GEPAN (Groupe d'études des phénomènes aérospatiaux non identifiés) — France's official, government-funded UFO research group, then operating under the national space agency CNES. GEPAN engaged a network of laboratories, including the National Institute for Agronomic Research, in a multi-year analysis.
The 66-page GEPAN technical report, formally Note Technique no. 16, concluded that a heavy object had pressed into the soil while heating it to between 300 and 600 degrees Celsius, that the soil within the landing trace showed unusual mineral and physical-chemical changes, and that the alfalfa nearby had suffered loss of chlorophyll and other biochemical anomalies that intensified toward the centre of the trace. The report's lead author, Jean-Jacques Velasco, stated that no conventional cause could account for the totality of the findings.
GEPAN's successor agencies (SEPRA, then GEIPAN) have publicly described Trans-en-Provence as one of the most thoroughly investigated and physically substantiated UFO cases in their archives. The case is significant because it represents a state-funded scientific investigation of a single-witness sighting that nonetheless yielded measurable, replicable physical anomalies.