Dalnegorsk "Height 611" Incident (29 Jan 1986).

The Dalnegorsk incident of 29 January 1986 was the crash of a reddish glowing sphere onto Izvestkovaya Sopka (Height 611) hill in the Soviet Far East. Investigators recovered fused 'mesh,' silica beads and metallic droplets that lab analysis described as having unusual metallurgical properties. It matters as a Soviet physical-trace case studied under the Setka program; the residue is real and was analyzed, but an extraterrestrial origin is unconfirmed and disputed, with mundane explanations (e.g. a bolide or man-made debris) also proposed.