Document · December 2000

Unidentified Aerial Phenomena in the UK Air Defence Region: Executive Summary (Project Condign, 2000)

Also known as Condign report, Condign Report, UAP in the UK Air Defence Region, Scientific & Technical Memorandum 55/2/00, DI55 UAP report

The Executive Summary of the Defence Intelligence Staff's study of unidentified aerial phenomena, Project Condign, prepared for branch DI55 and dated December 2000 (its preface is dated February 2000). It sums up four volumes: the main report on the MoD's database of some 30 years of reports and its statistics, 25 technical papers on natural and man-made phenomena, and a secret volume on radar, hazards to aircraft and military applications. Opening with Churchill's 1952 minute, "What does all this stuff about flying saucers amount to?", it calls the existence of UAP "indisputable" but concludes that the reports are of no significant Defence Intelligence value.

It found no evidence that any UAP were craft of extraterrestrial or foreign origin, or hostile, and no artefacts. It attributes the reports to misidentified man-made vehicles, ordinary natural phenomena and rare natural ones, above all buoyant, electrically charged plasmas, which it suggests may be formed by meteors and which it uses to explain black triangles, radar returns, close-encounter effects on witnesses and vehicle failures. It recommended that DI55 stop monitoring UAP reports, which it did from December 2000, and that pilots be told not to manoeuvre against a UAP.

The plasma explanations are the study's own hypotheses, stated as such, not tested findings. The MoD released the report with redactions in May 2006 after a Freedom of Information request; the copy on file is the Executive Summary from the MoD website. Volumes 1 to 3 were published there too and are still to be added.

Sources: Executive Summary, S&T Memorandum 55/2/00 (MoD release, 2006; local copy) · MoD FOI publication-scheme page (web archive)

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