PURSUE Record — FBI 62-HQ-83894 — Stuart Adcock Oak Ridge incident (March 1950): Federal Bureau of Investigation · Oak Ridge, Tennessee · March 1950

FBI case file 62-HQ-83894 is a declassified Federal Bureau of Investigation document released on May 8, 2026 as part of PURSUE Release 01, the first tranche of UAP-related records coordinated by the U.S. Department of War. It concerns an incident reported by a witness named Stuart Adcock at the Oak Ridge atomic installation in Tennessee in March 1950. The record is a single-part PDF — one document, one case entry — drawn from the Bureau's historical archive and now part of the public record.

What this record contains

The file carries FBI case number 62-HQ-83894 and documents a March 1950 incident at Oak Ridge, Tennessee — one of the country's most sensitive nuclear facilities at the time. The releasing agency is the Federal Bureau of Investigation, and the record is catalogued as a single PDF in the PURSUE Release 01 set. According to the official description accompanying the release, this is "FBI 62-HQ-83894 material on a March 1950 incident involving witness Stuart Adcock at the Oak Ridge atomic installation," described as "part of the cluster of Oak Ridge observations the FBI documented through inter-agency channels with the Atomic Energy Commission."

Beyond that framing, the public release metadata does not include granular detail about the specific nature of what Adcock reported — no shapes, no trajectories, no duration are specified in the released description. The record's significance, as flagged by the releasing authority, lies in its institutional provenance: it is "on the institutional record at a sensitive nuclear-weapons facility," meaning the observation was formally logged by federal investigators, not dismissed informally.

Historical & documentary context

March 1950 sits squarely in the early Cold War era of organized UAP investigation. The Air Force's Project Sign had already concluded its work, Project Grudge was underway, and the FBI had been drawn into aerial anomaly reporting through its relationship with military intelligence and, critically, the Atomic Energy Commission. Oak Ridge — the site of wartime Manhattan Project uranium enrichment — remained one of the highest-security installations in the United States. Observations near or above it were treated with particular gravity, since any unidentified aircraft in that airspace carried obvious national-security implications. The Bureau's practice of documenting such reports through inter-agency channels with the AEC was not unusual for the period; what distinguished the Oak Ridge cluster was the concentration of reports at a single, strategically critical location.

This record belongs to a cohort of FBI files from roughly 1947 to the mid-1950s in which field offices forwarded anomalous aerial reports upward through the intelligence bureaucracy. These were not investigations in the criminal-case sense — they were information-routing exercises, preserving witness accounts for whatever agency might eventually act on them. The survival of this file into the 2026 declassification cycle suggests it was retained as unresolved rather than closed.

What this does and does not prove

What the record establishes is narrow but real: a named witness — Stuart Adcock — made a report at or near the Oak Ridge atomic installation in March 1950, the FBI logged it under a formal case number, and that case was coordinated with the Atomic Energy Commission through official channels. That is the documented fact. What it does not establish is the nature, origin, or explanation for whatever Adcock observed. The public release metadata contains no technical description of the reported phenomenon, no investigative conclusion, and no subsequent disposition of the case. "Unresolved" in the PURSUE framework means the case has not been explained — it does not mean anything anomalous has been confirmed. Readers should resist reading evidential weight into institutional seriousness; the FBI logged these reports because the location demanded caution, not because the Bureau had concluded something extraordinary was occurring.

How it fits PURSUE Release 01

Within the 120-PDF historical archive component of PURSUE Release 01, this record is one of a recognizable FBI sub-series — Cold War-era field reports routed through intelligence channels and preserved without resolution. It sits alongside other Bureau files dating to the late 1940s and 1950s, forming a documentary layer that predates modern sensor-based UAP collection by decades. For context on how this record relates to the full 162-document release — including the 28 videos and 14 images that represent contemporary sensor collection — the complete catalogue is available on the SkyLens UAP files page. For editorial coverage of other cases in this FBI archive series and the broader PURSUE Release 01 set, see the SkyLens blog.

Editorial note: This analysis is independent commentary on a publicly released document. The original record, source links, and full release metadata are catalogued on the SkyLens UAP files page alongside every other case in the PURSUE Release 01 set.