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1986 · Palmar hydroelectric dam, Río Negro, Uruguay

Uruguay's CRIDOVNI and the Palmar dam chase

Lead
Strength C · 6/10 · 1 independent
Evidence 3/4 · Witnesses 2/3 · Backing 1/3

Air Force commission officials confirm the file exists, but the pilots are unnamed and the file is unpublished.

Plausibility Moderate
Score 10 · 7 factors for, 0 against

Air Force commission officials confirm a file on Pucará pilots failing to intercept a sphere over a dam; the pilots are unnamed and the file unpublished.

See the factors ↓

Unresolved
Canal 10: the FAU investigates UFO sightings in Uruguay · Canal 10 Uruguay
When1986 (exact date not found)
WherePalmar hydroelectric dam, Río Negro, Uruguay
Backing1 independent
Evidenceofficial records

The archive. CRIDOVNI (Comisión Receptora e Investigadora de Denuncias de Objetos Voladores No Identificados) is the Uruguayan Air Force (FAU) commission for UFO reports. It was set up in 1979, and Uruguayan officials describe it as the first official body of its kind in South America. It is a mixed military-civilian commission: three FAU officers plus civilian investigators, building on the methods of the civilian group CIOVI. It works with universities, laboratories and planetariums, and has no budget of its own. - Caseload, 2010 (Col. Ariel Sánchez): 2,200 reports received since its creation; 1,204 investigated; about 3% ("unos cuarenta casos") unresolved. - Breakdown, given by Lt. Daniel Silvera: 70% closed as explained and 27% on "stand by". 11% of testimonies came from qualified witnesses (pilots, meteorologists, controllers), and 7% of cases had physical evidence. - Recent work: it took on the Paysandú lights in 2023. A 2026 report says it began sharing information with the US AARO. - No public archive. Unlike Chile's, Argentina's or Italy's, Uruguay has published no file archive. Sánchez said the files stay confidential under Uruguay's privacy law because they hold witnesses' names and addresses. The commission answers specific questions and releases final reports, not the folders. - The CRIDOVNI material on the UFO Transparency mirror is empty (the /international/files/uy listing has no files). The case. By CRIDOVNI's own account, its most important unresolved cases are two involving the FAU itself, in which aircraft made visual contact with "esferas lumínicas" and failed to intercept them. The one Sánchez described in detail is the Palmar dam case of 1986: - FAU IA-58 Pucará aircraft on training manoeuvres near the dam, in a restricted zone, saw a round luminous object hovering over the dam. - They checked with the control tower, which had no traffic. They closed on the object twice, and it evaded both times, the second time heading west and changing from yellowish-white to reddish-orange. - A major blackout hit Montevideo, traced to an overheated line or transformer at the dam. Sánchez said the timing coincided but "we are not able to prove that the object actually affected the transformer." Every detail comes from interviews with commission members. No document from the case file has been published, so this is graded lead.

Evidence, in date order (1)

  1. 2010CRIDOVNI (Col. Ariel Sánchez, Lt. Daniel Silvera)official
    Air Force commission holds the case as unresolved after investigation Open Minds, interview with Col. Ariel Sánchez of CRIDOVNI

How plausible · Moderate

Air Force commission officials confirm a file on Pucará pilots failing to intercept a sphere over a dam; the pilots are unnamed and the file unpublished.

  • ●●
    Access Pilots on the intercept.
  • ●●
    No gain sought Official commission.
  • ●●
    Fits the documented skeleton CRIDOVNI is an official Air Force body.
  • ●○
    Restraint "No definitive explanation."
  • ●○
    Character record Commission officials named; pilots not.
  • ●○
    Fits secrecy practice File unpublished.

Plausibility weighs how well an account fits where secrecy hides the documents by design, so missing records never count against it. Strength measures what is documented. Assessed 2026-10-23.

On the record

  • CRIDOVNI is an official FAU body, created in 1979. Officials quoted in the press: Col. Ariel Sánchez (2010, 2012-13) and Lt. Daniel Silvera.
  • From Sánchez (Montevideo Portal, 2010; official spokesman): 2,200 complaints received; 1,204 investigated; 3% unresolved ("unos cuarenta casos"); unresolved cases are archived pending new scientific or technical means.
  • Silvera called the two FAU cases the most important. They were "vividos por la propia FAU, y conforman ese 3% de casos con mucha información", "en que aeronaves se ven involucradas, entrando en contacto visual con esferas lumínicas" (official spokesman, Montevideo Portal).
  • Files are confidential because "they provide the identity and the address" of witnesses (Sánchez, Open Minds).

Claims

Pucará pilots on training manoeuvres saw a round luminous object hovering over the Palmar dam; the tower reported no traffic; two approaches failed as the object evaded, finally heading west and changing colour from yellowish-white to reddish-orangesecondhandLeadFAU pilots (unnamed); chain: pilots → CRIDOVNI file → Col. Ariel Sánchez → Open Minds (2013)
The object was "flying just above the transformer" when it failed, and a major Montevideo blackout followedsecondhandLeadCol. Ariel Sánchez; chain: CRIDOVNI investigation → Sánchez → Open Minds
In both FAU cases an attempt to intercept the spheres failedsecondhandLeadreporter's summary, Montevideo Portal, of Silvera's account
These cases carry "an eighty percent probability of an unconventional phenomenonanalysisLeadCol. Ariel Sánchez (speaking personally, not for the commission)
The two aircraft were IA-58 Pucarás on a routine exercise, and the investigation never reached a definitive explanationsecondhandLead*Prensa Mercosur*, 20 Apr 2026 (search summary only; the page returned 403 and was not read)

Where

Palmar hydroelectric dam, Río Negro, Uruguay
33.1°S 57.5°W

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