Project Blue Book Case File
[ILLEGIBLE], [ILLEGIBLE] 1952Circa 1952
Summary
On September 14, 1952, a naval destroyer participating in Operation Mainbrace, a major NATO military exercise, observed three unidentified objects moving rapidly across the sky north of the island of Bornholm in the Baltic Sea. The objects flew in level flight at approximately 1,000 meters altitude, moving on a southerly course. They were arranged in a triangular formation with the apex pointing south. The observer, impressed by their speed, estimated they were traveling at around 1,500 kilometers per hour (930 miles per hour). The objects made no noise and produced no smoke, though there appeared to be white light coming from their rear.
The objects changed bearing sharply, shifting from 322 degrees to 249 degrees in just five to ten seconds, a maneuver that would require considerable acceleration. The witness described them as bluish and glowing in appearance. Distance measurements were not recorded, so the accuracy of the speed estimate could not be verified.
The sighting gained wider attention when the press reported similar observations made around the same time by other participants in Operation Mainbrace, including an American photographer who captured images near the naval force and British airmen who observed something moving faster than a shooting star. The British observers noted the object changed course over the Hanover area. Military officials treated the reports seriously enough to brief the Supreme Allied Commander Atlantic.
When photographs submitted for analysis were forwarded to the Air Force's Technical Intelligence Center, they were identified as a weather balloon, the type used to measure atmospheric conditions. The Air Force file indicates the most likely explanation for the sightings was a balloon, though the report does not rule out other possibilities. The complete case file, as preserved by the National Archives, spans 7 pages.
Reported location
[ILLEGIBLE], [ILLEGIBLE] 1952
Date of incident
Circa 1952
State / country
? / XX
Page count
7 scanned pages
USAF evaluation
unknown
Microfilm
T1206, Roll 15