Petrozavodsk Phenomenon — Soviet City Illuminated 1977
One of the most widely observed Soviet UAP events, occurring at 4am over the city of Petrozavodsk in Karelia. A large luminous jellyfish-like object hovered over the city for 12 minutes, illuminating streets with rotating beams. Thousands of citizens and vessels on Lake Onega observed the phenomenon. The Soviet news agency TASS reported the event publicly — an almost unprecedented acknowledgment. Soviet and Finnish scientists investigated; the event was ultimately unexplained.