CORROBORATED
CF-GEI-20100402616 CORROBORATED

The Saint-Alban-Leysse Lights: Thai Lantern Formation

CASE FILE — CF-GEI-20100402616 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
2010-04-24
Location Reported location of the sighting or event
Saint-Alban-Leysse, Savoie, France
Duration Estimated duration of the observed phenomenon
several minutes
Object Type Classification of the observed object based on witness descriptions
formation
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
2
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On April 24, 2010, at approximately 23:30 (11:30 PM), two witnesses in Saint-Alban-Leysse, Savoie region of France, observed approximately thirty luminous objects moving silently across the night sky. The lights traveled in the same direction as a cohesive formation, with no audible sound accompanying them. Over the course of several minutes, the number of visible lights gradually decreased until they completely disappeared from view. One witness had the presence of mind to film the phenomenon. Following the observation, the primary witness conducted independent research and concluded that what they had observed were Thai lanterns (sky lanterns). GEIPAN's official investigation file confirms this assessment, classifying the case as 'B' - likely explained by a known phenomenon. The investigation noted that no other witnesses came forward to report the passage or origin of these floating lanterns, and no evidence suggested an alternative explanation. This case represents a typical misidentification of celebratory sky lanterns, which can create compelling UFO reports when released in groups. The silent movement, formation behavior, gradual disappearance, and number of objects all align perfectly with the characteristics of Thai lanterns carried by wind currents.
02 Timeline of Events
23:30
Initial Sighting
Two witnesses observe approximately 30 luminous objects appearing in the night sky over Saint-Alban-Leysse
23:30-23:35
Formation Movement Observed
Lights move silently across the sky in the same direction, maintaining formation. Witness begins filming the phenomenon
23:35-23:40
Gradual Disappearance
The number of visible lights progressively decreases over several minutes as objects drift away or burn out
23:40
Complete Disappearance
All lights completely disappear from view
After observation
Witness Research
Primary witness conducts independent research and concludes the objects were Thai lanterns
Investigation period
GEIPAN Classification
GEIPAN investigates and classifies the case as 'B' - probable observation of Thai lanterns. No additional witnesses located
03 Key Witnesses
Anonymous Witness 1
Civilian observer
high
Primary witness who filmed the event and conducted independent research to identify the phenomenon as Thai lanterns
"The witness concluded after some research on the passage of Thai lanterns"
Anonymous Witness 2
Civilian observer
medium
Second witness present during the observation
04 Analyst Notes -- AI Processed
The credibility of this case as an explained phenomenon is very high. The witness demonstrated commendable critical thinking by conducting their own research and reaching the correct conclusion before GEIPAN's official assessment. The fact that video evidence was obtained (though not detailed in available documentation) adds weight to both the observation and the explanation. The characteristics described - silent flight, formation movement, gradual disappearance, and the specific number (approximately 30) - are textbook indicators of sky lantern releases, often associated with celebrations, weddings, or festivals. GEIPAN's 'B' classification indicates that while absolute certainty cannot be achieved (no physical evidence of lanterns was recovered, and no release event was confirmed), the probability is very high that this explanation is correct. The absence of additional witness reports is notable but not unusual for a late-night event in what may be a less densely populated area. The gradual decrease in visible lights suggests they either burned out, drifted beyond visual range, or were obscured by atmospheric conditions - all consistent with sky lantern behavior.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Sky Lantern Release
The witnesses observed a mass release of Thai sky lanterns (lanternes thaïlandaises), likely from a celebration, wedding, or festival. The silent flight, formation movement in the same direction (determined by wind), the specific number of approximately 30 objects, and the gradual disappearance as fuel sources burned out all perfectly match sky lantern characteristics. The witness's own research and GEIPAN's investigation both support this conclusion.
06 Verdict
ANALYST VERDICT
This case is almost certainly explained as a mass release of Thai sky lanterns. The witness's own conclusion, supported by GEIPAN's analysis, is compelling and fits all observed characteristics. The formation behavior, silent movement, gradual disappearance over several minutes, and the approximate count of 30 objects all match documented sky lantern releases. While no physical evidence or confirmed lantern launch was documented, the probability of this explanation approaches certainty. This case holds minimal significance as a genuine anomaly but serves as an excellent example of how celebratory sky lanterns can create convincing UFO reports, and demonstrates the value of witness self-education and critical thinking in resolving sightings.
AI CONFIDENCE SCORE:
85%
07 Community Discussion
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