Interlaken and Winterthur Mirage III Sightings (1971)

The reports

On the night of 23 February 1971, two officers on a night Mirage III flight over Interlaken saw a bright light moving in a fast, wave-like, snake-shaped path before it vanished. Their motion, as the report describes it, was impossible for a military aircraft of that era. Hours later, another Mirage III pilot reported the same object over Winterthur, more than 100 km to the north-east, sketching its movement and size and saying the sighting lasted several dozen minutes.

About three days later a third Mirage III pilot saw a light that he first took for an aircraft approaching with its landing lights on. It did not move, and he then noticed a trail spreading at roughly 90 degrees before the light moved off and disappeared. The three reports were filed as the same object.

Records and the archive problem

The reports were brought to public attention in October and November 2024 by François Ruchti of Swiss broadcaster RTS, who reviewed the federal UFO files for Mise au point. The originals are missing. The former Federal Military Library at Place Guisan holds only copies, and the federal administration anonymised them, removing the pilots' names. The Federal Archives in Bern hold the wider collection of Air Force UFO forms, most of which the RTS reporting says were destroyed.

The Swiss Defence Department told RTS the army was never tasked with collecting UFO information and that the reports were classified only after routine debriefings. No scientific explanation was recorded.

Explanations and assessment

Former Mirage pilot Michel Perdrisat, who flew the type from 1970 to 1981, recalled that the crews considered a satellite re-entry and rejected it because the sighting lasted too long. Former commander Ernst Gmünder, who wrote one of the reports, confirmed that the sighting was unusual but no longer remembers the details or the leadership's response. Those recollections are decades after the event and cannot settle what the crews saw.

The case is documented by official records, which gives it more weight than most secondhand Swiss accounts. The sightings rest on three written pilot reports whose authors are unnamed in the archived copies, with no radar track, photograph, or physical trace. Without the originals, the descriptions cannot be checked against the record in full, so the case stays unexplained rather than extraordinary.

Why it matters

The Interlaken reports are notable because they come from a jet fighter force and were filed through ordinary military channels, not from civilians or contactee literature. They show that by 1971 European air forces were logging unidentified visual reports in the same routine way as US Project Blue Book, a theme that connects to the wider Cold War-era UFO reporting in Europe.