UAP · Unresolved Cases

SCIENCE AND TECHNOLOGY · ANOMALOUS AERIAL PHENOMENA

THE LIST OF THE UNRESOLVABLE

Ten UAP incidents that science still cannot close

Why these ten cases matter

Since 2017, when The New York Times brought the infrared videos “FLIR1,” “Gimbal,” and “GoFast” out of the drawer, the UFO phenomenon—officially renamed UAP, Unidentified Anomalous Phenomena—ceased to be the exclusive territory of tabloid culture and became an object of scrutiny by the Pentagon, the U.S. Congress, and the astrophysical community. The All-domain Anomaly Resolution Office (AARO) has catalogued thousands of reports since 2022; the vast majority are explained by weather balloons, drones, optical reflections, or atmospheric phenomena. But a small number resist that filter. These are cases involving multiple independent witnesses, instrumental corroboration—radar, infrared tracking cameras, air-traffic-control records—and the absence of a satisfactory conventional explanation even after official investigations. Here is a selection of ten of them, arranged chronologically, with what is known, what has been ruled out, and what remains open.

1. THE WASHINGTON, D.C. WAVE (JULY 1952)

During two consecutive weekends in July 1952, the radars of the National Airport Traffic Control Center in Washington and Andrews Air Force Base detected multiple unidentified contacts flying over the U.S. capital, some coinciding with lights observed by commercial pilots and controllers. The Air Force dispatched F-94 Starfire fighters to intercept them; according to the pilots, the objects accelerated and disappeared in ways that the equipment of the time considered incompatible with known aircraft. The case prompted the CIA to convene the Robertson Panel, whose 1953 report—declassified decades later—explicitly recommended reducing the phenomenon’s public credibility in order to prevent saturation of air-defense channels during the Cold War. The official explanation was a temperature inversion producing false radar echoes, but that hypothesis does not account for the simultaneous visual observations from the ground and the air.

 

 

2. MALMSTROM AFB, MONTANA (MARCH 1967)

At Malmstrom missile base, security guards reported a disk-shaped object with a pulsing reddish light hovering above the entrance to a Minuteman I missile-silo facility. Minutes later, ten intercontinental missiles simultaneously went offline, a failure that—according to then-launch officer Robert Salas and his superior, Colonel Frederick Meiwald—was technically unlikely because each guidance system operated independently and was shielded against electromagnetic interference. Researcher Robert Hastings documented similar episodes at other U.S. and Soviet nuclear bases between the 1960s and 1980s. In 2023, The Wall Street Journal proposed that the incident corresponded to a secret electromagnetic-pulse test; Hastings and other witnesses rejected that version for lack of logistical evidence supporting the deployment of a twenty-meter EMP generator without any other personnel noticing it.

3. THE TEHRAN PHANTOMS (SEPTEMBER 1976)

A bright object over Tehran prompted the Iranian Air Force to scramble two F-4 Phantom II fighters. According to the report later sent to the U.S. Defense Intelligence Agency, both aircraft experienced instrumentation and communications failures as they approached the object, and one pilot claimed he had been “locked onto” by a missile fired from the UAP that then separated from the main object and landed, according to his testimony, in the desert. The declassified document—known as the “1976 Tehran Telegram”—is frequently cited by intelligence analysts as one of the best-documented military files concerning the loss of electronic systems during an encounter. There is no consensus explanation; hypotheses range from Venus with atmospheric refraction to a reentering satellite, none of which convincingly explains the simultaneous failure of radar, radio, and weapons systems aboard two different aircraft.

4. RENDLESHAM FOREST (DECEMBER 1980)

Known as the “British Roswell,” the incident occurred in the forests near the twin Royal Air Force bases at Bentwaters and Woodbridge, then operated by U.S. personnel. Over three nights, security patrols reported triangular lights maneuvering among the trees and, according to the base deputy commander, Lieutenant Colonel Charles Halt, anomalous radiation readings at the reported landing site. The memorandum Halt sent to the British Ministry of Defence—declassified in 2001—described the object as metallic, triangular in cross-section, with unidentified symbols engraved on its surface. Skeptics such as Ian Ridpath attribute the episode to confusion between the rotating beam of the Orfordness lighthouse and observations of Jupiter that night, but that explanation does not cover the entirety of Halt’s account, recorded in real time on an audio tape that is still preserved today.

5. THE BELGIAN WAVE (NOVEMBER 1989–APRIL 1990)

Between late 1989 and early 1990, more than three thousand people in Belgium—including police officers on duty—reported a triangular object with lights at each vertex, flying silently and performing acceleration maneuvers incompatible with conventional aviation of the period. On March 30, 1990, two Belgian Air Force F-16s were authorized to intercept after ground radar confirmation; the pilots achieved radar lock on the object several times, but each time it made changes in speed and altitude—including accelerations that the flight records themselves placed far beyond what a human pilot could tolerate—that instantly broke the lock. The Belgian Ministry of Defence published the radar data and publicly acknowledged its inability to identify the object, an unusual case of European military transparency concerning the phenomenon.

6. JAL1628 FLIGHT OVER ALASKA (NOVEMBER 1986)

Captain Kenju Terauchi, pilot of a Japan Airlines Boeing 747 freighter, reported to Anchorage air traffic control the presence of two objects with lights that flew in formation with his aircraft for several minutes, followed by a third, larger object whose silhouette, according to his testimony, blocked out the stars. Air-traffic-control radar and NORAD military radar recorded an additional contact coinciding with the position reported by the crew, although intermittently. The Federal Aviation Administration (FAA) conducted an official investigation whose report concluded that there was no satisfactory conventional explanation, although it speculated about radar echoes duplicated by the aircraft itself. Terauchi, a pilot with thousands of flight hours and no prior history of anomalous reports, maintained his account until his death in 2019.

7. THE PHOENIX LIGHTS (MARCH 1997)

Thousands of residents of Arizona and Nevada observed a large formation of lights—described by many witnesses as a solid V-shaped object with fixed, non-blinking lights—that crossed the state at low altitude and constant speed for almost an hour. A second phase of the event, that same night, consisted of a stationary pattern of lights over the city of Phoenix. The governor of Arizona at the time, Fife Symington, who initially ridiculed the phenomenon at a press conference, acknowledged years later that he had been a direct witness and rejected the claim that it was the military flares the Air Force used to explain the second phase. The first phase—the V-shaped formation observed by hundreds of independent witnesses across more than three hundred kilometers—never received a conclusive official explanation.

8. ARIEL SCHOOL, ZIMBABWE (SEPTEMBER 1994)

In a case unusual for involving minors as the principal witnesses, sixty-two students at a primary school in Ruwa, Zimbabwe, described during recess the landing of one or more craft and the appearance of humanoid figures that, according to accounts they gave independently to different adult interviewers, telepathically conveyed a message about the planet’s environmental deterioration. Child psychiatrist John Mack of Harvard University interviewed a group of the children months later and documented remarkable consistency in the details of their accounts despite the absence of prior contact among the witnesses, a finding that, in his clinical assessment, ruled out both collective fabrication and subsequent narrative contagion. The case remains one of the most frequently cited files concerning “close encounters of the third kind”—according to astronomer J. Allen Hynek’s classification—in the academic literature on children’s testimony.

9. THE USS NIMITZ “TIC TAC” (NOVEMBER 2004)

Off the coast of San Diego, Commander David Fravor and his flight companion, F/A-18F Super Hornet pilots from the aircraft carrier USS Nimitz, were diverted to investigate a radar contact that the cruiser USS Princeton had been tracking intermittently for two weeks at altitudes ranging, according to the records, from sea level to fifteen thousand meters within seconds. Fravor described a white, oval object approximately the size of an F/A-18, with no visible wings, rotors, or control surfaces, which reacted to the approach of his fighter with a climb and disappearance maneuver that he himself characterized, in his testimony before Congress in 2023, as “not belonging to any technology known to me in twenty years of naval aviation.” The infrared video captured minutes later by another fighter on the same mission—known as “FLIR1”—was confirmed as authentic by the Department of Defense itself in 2020.

10. STEPHENVILLE, TEXAS (JANUARY 2008)

Dozens of residents of this Texas town, including a retired police pilot and several commercial pilots, reported a large, silent object with intense lights moving at low altitude over the area, followed—according to some witnesses—by military fighters. The Air Force initially denied having aircraft in the area that night, and only weeks later acknowledged that ten Air National Guard F-16s had been conducting a training exercise in the area at the reported time, a correction that fueled public distrust regarding official transparency. The case combines an unusually high number of qualified witnesses—pilots with technical training capable of estimating size, speed, and altitude—with an institutional response that, documented through FOIA records, changed its version more than once.

THE PATTERN BEHIND THE NOISE

No serious scientific body maintains that these ten cases prove an extraterrestrial hypothesis. What they share, and why they resist being placed in the “identified” file, is an unusual combination of three factors: multiple independent and qualified witnesses, instrumental corroboration—radar, infrared, or official records—and a chain of institutional investigation that, in each case, documented in writing that no conventional explanation had been found. AARO’s 2024 annual report continues to classify around 3% of the more than one thousand cases analyzed since 1996 as genuinely “unresolved” after ruling out prosaic explanations, a percentage that, applied to the historical volume of reports, by itself supports continued scientific interest in the phenomenon, regardless of what its final explanation may prove to be.

GLOSSARY

UAP (Unidentified Anomalous Phenomena): the term officially adopted by the U.S. Department of Defense since 2022 to replace “UFO,” covering aerial, underwater, and transmedium phenomena without restricting the term to an extraterrestrial connotation.

AARO (All-domain Anomaly Resolution Office): Pentagon office created in 2022 to centralize the government’s investigation of UAP reports.

FLIR (Forward-Looking Infrared): an infrared camera system installed on aircraft for the thermal detection and tracking of objects.

Radar lock: the process by which a tracking radar system locks onto and automatically follows a specific contact, allowing its speed and trajectory to be measured precisely.

Close encounter of the third kind: a category in astronomer J. Allen Hynek’s scale (1972) designating the sighting of alleged occupants associated with a UAP, as opposed to a simple visual or instrumental sighting.

Robertson Panel: committee convened by the CIA in 1953 to evaluate the UFO phenomenon; its report recommended publicly dismissing reports for national-security reasons during the Cold War.

Electromagnetic pulse (EMP): a burst of electromagnetic energy capable of damaging or disabling electronic equipment, proposed as an alternative explanation for incidents involving simultaneous technical failures.

Temperature inversion: an atmospheric phenomenon in which a layer of warm air lies above a layer of cold air, capable of generating anomalous radar echoes or optical mirages.

FOIA (Freedom of Information Act): U.S. law providing access to information that allows requests for the declassification of government documents, a primary source for many of the files cited here.

REFERENCES

1. The New York Times, “2 Navy Airmen and an Object That ‘Accelerated Like Nothing I’ve Ever Seen’” (2019) — nytimes.com/2019/05/26/us/politics/ufo-sighting-navy-fighter-jet.html
2. Office of the Director of National Intelligence / AARO, “Historical Record Report Volume I” (2024) — dni.gov/index.php/newsroom/reports-publications
3. Central Intelligence Agency, “Report of Scientific Advisory Panel on Unidentified Flying Objects” [Robertson Panel], declassified — cia.gov/readingroom
4. National Archives (UK/US), Defense Intelligence Agency file on the 1976 Tehran incident — nationalarchives.gov.uk
5. Ministry of Defence (United Kingdom), Charles Halt memorandum on Rendlesham Forest (1981, declassified 2001) — nationalarchives.gov.uk
6. Federal Aviation Administration, report on JAL1628 flight (1986), NARA archive
7. Hastings, Robert. UFOs and Nukes: Extraordinary Encounters at Nuclear Weapons Sites. 2008.
8. Mack, John E. Passport to the Cosmos. 1999 (chapter on the Ariel School case, Zimbabwe).
9. U.S. House Oversight Committee, hearing and testimony of David Fravor (July 2023) — oversight.house.gov
10. Belgian Ministry of Defence / SOBEPS, radar data from the 1989–1990 Belgian UFO wave, SOBEPS report (1991).