Spiral or helical flight patterns that combine rotation with directional movement — observed at high altitudes and airspeeds.
Commercial PanAm aircraft at 41,000 ft encountered an object performing circles, corkscrews and 90-degree turns at rapid rates. State Department diplomatic cable filed. No military explanation found.
The Tunguska explosion of June 30, 1908 — the largest impact event in recorded history — has generated persistent debate about whether the trajectory of the incoming object was consistent with a natural bolide or showed evidence of controlled flight. Russian scientist Alexei Zolotov published research suggesting the trajectory showed an anomalous correction inconsistent with a freely-falling body. The lack of recovered meteorite material and the unusual airburst characteristics have kept the event in the UAP-adjacent literature for over a century.
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