What happened
Among the reports: a blue-green triangle flying at about 1,500 m.p.h., and three objects in a triangle formation giving off white exhaust at the same speed.
"one blue-green triangle"Shape words from the Project Blue Book summary
Witnesses
Military personnel of several nations aboard ships in the NATO exercise Operation Mainbrace
Explanation
Unresolved
No explanation has been found.
Sources
- Patrick Gross, Project Blue Book unknowns of 1952ufologie.patrickgross.org
- The Black Vault, Project Blue Book unknown case files, complete listtheblackvault.com
Filed by Project Blue Book as unidentified.