FBI's 21-Year UAP Case File, Section 6

Brief

The FBI's 62-HQ-83894 file documents UAP-related investigative activity across two decades of the Cold War era. It includes photographic evidence gathered at Oak Ridge, Tennessee — the heart of the U.S. nuclear complex — alongside eyewitness accounts and technical proposals concerning potential propulsion systems. The file also reflects bureau monitoring of civilian UAP research through convention programs and researcher accounts. This release supersedes the partially posted FBI vault version, restoring previously redacted pages with only minor remaining redactions.

Metadata

Agency

FBI

Release

5/8/26

Type

PDF • .pdf

Length

271 pages

Classification

UNCLASSIFIED

Tags

flying disc, UAP, photography, Oak Ridge TN, nuclear site proximity, 1947–1968, propulsion research, civilian researcher monitoring

Key points

• File covers June 1947 through July 1968, spanning the initial flying disc wave through two decades of Cold War-era UAP activity.
• Photographic evidence is documented from Oak Ridge, Tennessee — site of the Manhattan Project's uranium enrichment operations and a persistent focus of early UAP reports near nuclear infrastructure.
• File includes technical proposals regarding potential UAP propulsion systems, indicating the FBI tracked civilian and possibly foreign interest in UAP mechanics.
• Convention programs and researcher accounts are included, suggesting the bureau monitored organized civilian UFO research communities.
• Extensive media coverage from the period is preserved, reflecting the public salience of the phenomenon across the entire time span.
• This release is described as the complete case file with several newly declassified pages, containing fewer redactions than the version available on the FBI vault.

Most interesting

• Oak Ridge, Tennessee was simultaneously the most sensitive nuclear site in the United States and a documented location of UAP photographic evidence in this file — a pairing that recurs across multiple agencies' early Cold War records.
• The file opens in June 1947, the same month as the Kenneth Arnold sighting that ignited the modern flying disc era, suggesting the case was opened in direct response to that wave.
• The inclusion of technical propulsion proposals inside an FBI investigative file — rather than an Air Force or AEC file — indicates the bureau's role extended beyond counterintelligence to tracking the technical theorizing community.
• At 21 years, this single case file spans virtually the entire duration of Project Blue Book (1952–1969), raising questions about what coordination, if any, occurred between the FBI and Air Force investigations.
• The war.gov release explicitly notes this version contains pages absent from the FBI vault posting, making it the most complete publicly available version of this case file as of the May 2026 disclosure.