Project Blue Book Case #6929. On August 29, 1960, witnesses in Crete, Illinois — a small community approximately 35 miles south of downtown Chicago — observed a bright object in the sky. Crete sits in the rural-suburban transition zone at the southern edge of the Chicago metropolitan area, where farmland begins to replace subdivisions.
Crete's position placed it beneath the southern approach corridors for both Midway and O'Hare airports, as well as within range of the Joliet Arsenal and the Argonne National Laboratory — a major nuclear research facility operated by the University of Chicago for the Atomic Energy Commission.
The 1960 timing fell during a quiet inter-wave period. The object could not be identified despite checks with regional airports and military facilities. The case was classified "Unknown."