Project Blue Book Case #1578. On July 23, 1952, witnesses in South Bend, Indiana — home to the University of Notre Dame — observed a bright object in the sky during what was the peak week of the great 1952 wave. The object's luminosity and behavior were inconsistent with any conventional aircraft operating in the region.
South Bend sits at the southernmost bend of the St. Joseph River in northern Indiana, approximately 90 miles east of Chicago. The city's airspace in 1952 was served by South Bend Airport (now South Bend International) and was within the broader Chicago air traffic area. Studebaker's automobile and defense manufacturing plants added to the city's strategic importance.
July 23, 1952, fell during the single most extraordinary week in Blue Book history. On July 19-20, unknown objects had been tracked on radar over Washington, D.C., for the first time. On July 26-27, they would return, prompting the largest Pentagon press conference since World War II. Between these two Washington events, sightings were being reported from coast to coast at an unprecedented rate.
The South Bend observation was one of hundreds during this peak week, but each case was logged and investigated — or at least catalogued — by Blue Book's overwhelmed staff. Captain Edward Ruppelt, the program's director, would later describe this period as a time when his small team simply could not keep up with the flood of reports.
No conventional explanation was found for the South Bend sighting. The case was classified "Unknown."