# The Socorro Arroyo [View on uap.fun]() CASE FILE 010 · 1964 Published: September 16, 2026 · Updated: September 17, 2026 Chasing a speeder in April 1964, patrolman Lonnie Zamora heard a roar and found a white egg on legs with two small figures beside it, one of which seemed startled to see him. It left in a blast of blue flame. The FBI measured four landing marks, the Air Force filed the case as unsolved, and Zamora was told to keep the red symbol on its hull a secret. Nobody can now say which symbol it was. ![Illustration of a back-facing 1960s police officer beside a white patrol car looking into a New Mexico arroyo toward a distant unresolved pale oval in dust.]() Not a real photo. ## AT A GLANCE - **DATE:** April 24, 1964 - **LOCATION:** An arroyo south of Socorro, New Mexico, USA - **REPORT TYPE:** Close encounter - **ENCOUNTER KIND:** [Third kind (CE3)]() — Based on Zamora’s report of small, white-clad figures near the object. Their identity was uncertain; ground traces were also reported. - **RESOLUTION:** [Unexplained]() - **RECORD STATUS:** Project Blue Book: unidentified; cause unresolved ## The story ### The speeder and the flame Late Friday afternoon on April 24, 1964, Socorro police officer Lonnie Zamora was chasing a speeding car south from the courthouse when a roar pulled his attention toward the desert. “Noise was a roar, not a blast. Not like a jet,” he told investigators that night. It slid “from high frequency to low frequency and then stopped.” To the southwest a flame was slowly descending behind a hill—“bluish and sort of orange too,” narrow, shaped like a funnel, with no smoke. A dynamite-storage shack stood in that direction. Zamora let the speeder go and turned onto a rough gravel track to see whether the shack had blown up. Loose stone defeated his patrol car twice before he crested the rise on the third try. Sources: [Officer Lonnie Zamora’s report]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() ### Something white in the arroyo From the ridge he saw a shiny shape in the gully, 150 to 200 yards off. “Car appeared to be up on radiator or on trunk,” he said; he thought some kids had turned one over. Beside it stood “two people in white coveralls.” He had them in view for perhaps two seconds. “One of these persons seemed to turn and look straight at my car and seemed startled—seemed to jump quickly somewhat.” They looked normal in shape, he said, “but possibly they were small adults or large kids.” The thing itself was “like aluminum—it was whitish against the mesa background, but not chrome,” oval, smooth, with no windows or doors, standing a few feet off the ground on legs that slanted outward. As he drove closer the arroyo rim hid it from view, and he radioed that he was checking a possible wreck. Sources: [Officer Lonnie Zamora’s report]() · [FBI documents on the Socorro landing report]() ### The roar returns Zamora stopped on the mesa, got out, and started down. He heard two or three loud thumps, “like someone possibly hammering or shutting a door or doors hard.” Then the roar began again, this time climbing: low frequency to high, “from loud to very loud.” A light blue flame, orange at the bottom, burst from beneath the object and kicked up dust. In the second before he turned, he noticed red lettering on its side, some two and a half feet high. Certain the thing was about to explode, he ran. He banged his leg on the patrol car’s rear fender, his glasses flew off, and he left them where they fell. About fifty feet past the car he threw himself over the edge of the hill and covered his face. Sources: [Officer Lonnie Zamora’s report]() ### Silence over the desert When the roar stopped, Zamora lifted his head. The object hung level with his car, twenty feet or so above the gully floor, and the flame was gone. There was a brief high whine and then nothing. “You could hear a pin drop,” he said on local radio. He watched the pale oval glide away just above the ground, clear the dynamite shack, and climb toward the mountains until he lost it. He ran back to the radio and told dispatcher Nep Lopez to look out the window for an object. Lopez asked what it was. “It looks like a balloon,” Zamora said. Lopez’s window faced north. Zamora collected his prescription glasses from the dirt; the green sunglasses he had been wearing over them stayed where they had landed. Sources: [Officer Lonnie Zamora’s report]() · [Lonnie Zamora and J. Allen Hynek radio interviews]() ### Chavez arrives after the departure New Mexico State Police Sgt. Sam Chavez reached him minutes later and asked what the trouble was, “because I was sweating and he told me I was white, very pale.” Zamora’s answer was to walk him down into the arroyo: “I asked the Sgt. to see what I saw, and that was the burning brush.” J. Allen Hynek later wrote that the sergeant had never seen Zamora in anything approaching that state. Lopez, meanwhile, had passed the call up the line as an object that had “landed and has taken off.” By evening Army Capt. Richard T. Holder of White Sands Missile Range and FBI agent Arthur Byrnes Jr., who happened to be in Socorro on other business, were taking Zamora’s statement line by line. Sources: [Officer Lonnie Zamora’s report]() · [FBI documents on the Socorro landing report]() · [Death of a Legend]() ### Four marks and scorched plants The FBI’s notes give the site in inches. Four rectangular depressions, roughly sixteen by six and about two deep, sat in an uneven quadrilateral about twelve feet apart. Nearby were several small round marks, four inches across, “as if a jar lid had gently been pushed into the sand.” Brush and clumps of grass in the middle were charred, yet grass between the burned spots was untouched, and the agents saw “no ‘blast’ effects.” The local paper reported that Chavez and Undersheriff Luckie found the brush still hot; an Air Force narrative has Chavez picking up a charred branch that was cold. Blue Book’s laboratories later found normal radiation, no foreign material in the soil, and no propellant residue on the plants. A later story that the sand had been fused to glass traces to what a woman named Mary Mayes told physicist James McDonald in 1968; New Mexico Tech physicist Charles Moore sifted the arroyo for it and found none. By Sunday afternoon, the Chieftain reported, “hundreds of curious persons had trampled the scene.” Sources: [FBI documents on the Socorro landing report]() · [The 1964 Socorro UFO Incident]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() · [Socorro, Fused Sand and Mary Mayes]() ![Scanned first page of the Project Blue Book report titled Unidentified Flying Object Report, Socorro, New Mexico, 24 April 1964.]() The opening summary page in the U.S. Air Force’s Socorro Project Blue Book case file. It records Zamora’s account, reported ground marks, and the first investigative checks; the complete case file runs to 168 pages. Project Blue Book, April 1964; public domain in the United States, via Wikimedia Commons. [Image source]() ### The mark on the hull Zamora sketched the red insignia that night on a paper sack. The Chieftain’s first story said he “was not at liberty to further describe the lettering,” and when a radio host asked him about an upside-down V with three lines, he answered, “they still don’t want me to say nothing about the markings.” The idea, by most accounts, was to hold the true design back as a test for copycat reports. It worked too well: two versions have circulated ever since. One is an arc over a vertical arrow with a bar beneath, which appears on a scrap Zamora signed in the Blue Book file. The other is an inverted V crossed by bars, which Hynek described on the air as looking like “a cattle brand” and which a Socorro dispatcher was taped describing in Spanish. Researcher Kevin Randle argues from the file that the arc is genuine; Ray Stanford, David Rudiak, and others hold that Holder had Zamora give out the arc as the decoy. No document records such an order. Sixty years on, nobody can say for certain which symbol Lonnie Zamora saw. Sources: [The 1964 Socorro UFO Incident]() · [Lonnie Zamora and J. Allen Hynek radio interviews]() · [A Final Analysis of the Socorro Symbol]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() ### Blue Book looks for an earthly vehicle Project Blue Book chief Hector Quintanilla began by assuming he was looking for something built in America. His investigators checked balloons, helicopters, civilian and military aircraft, White Sands and Holloman operations, radar stations, and the weather. “The White House Command Post was checked,” he wrote. Because the object sounded like a lunar lander, “letters were written to industrial companies engaged in lunar vehicle research activity. The companies were extremely cooperative, but to no avail.” He worked out its departure speed at about 120 miles an hour—“Not an interplanetary speed, at any rate.” Two years later, in the CIA’s in-house journal, he filed Socorro under the heading “Diagnosis: Unsolved.” “There is no doubt that Lonnie Zamora saw an object which left quite an impression on him,” he wrote. “He is puzzled by what he saw, and frankly, so are we. This is the best-documented case on record.” Sources: [The Investigation of UFOs — “Policeman’s Report” and “Diagnosis: Unsolved”]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() · [Project BLUE BOOK — records and Air Force fact sheet]() ### The officer behind the report In public, Zamora gave away less than he had told the investigators. “I wouldn’t say they were people,” he said on KSRC within days. “I saw something white, white coveralls.” Hynek, who came to Socorro as Blue Book’s scientific consultant, told the same station, “I’m as puzzled as you are,” and the Chieftain’s headline that week ran: “Dr. Hynek Feels Zamora’s Account Solid, Not a Hoax.” A year later Hynek wrote to the skeptic Donald Menzel that he and Quintanilla both “find it impossible to dismiss as a hoax.” He also passed along what the fame had cost. A teenager Zamora ticketed had sneered at him: “Don’t you know a flying saucer might come down on you any minute?” Zamora served fifteen years in all on the Socorro force, later ran the city landfill, and put in twenty-three years with the National Guard. He rarely spoke of the arroyo again. He died in Socorro on November 2, 2009, at seventy-six. Sources: [Lonnie Zamora and J. Allen Hynek radio interviews]() · [The 1964 Socorro UFO Incident]() · [Death of a Legend]() · [Obituary: Lonnie Zamora]() ### Surveyor, balloons, and a campus prank A test article from NASA’s Surveyor lunar program was flown slung beneath a helicopter at White Sands that day, but the documented test was far from Socorro, earlier in the day, and the hardware could neither resemble Zamora’s smooth oval nor leave under its own power. A balloon fits his own radio comparison and the silent drift, but not the roar or the flame. The liveliest alternative is a prank by students at New Mexico Tech, up the road. The school’s president, physicist Stirling Colgate, scribbled a note to Linus Pauling: “I have a good indication of the student who engineered the hoax. Student has left.” Writers date it variously to 1965 and 1968. In 2012 Colgate told researcher Anthony Bragalia by email that the device had been “a candle in a balloon. Not sophisticated,” and that three to six students were in on it. He could recall no more, and no student has ever come forward with a name, a photograph, or a method. Robert Sheaffer, the skeptic who first publicized the theory, ended by calling a student prank “very unlikely,” and nobody has explained how pranksters could have cleared out of open desert in the minutes before Chavez arrived. Sources: [Lonnie Zamora and the Socorro UFO]() · [Famous Socorro ‘UFO Landing’ a Student Prank?]() · [A Socorro Student Hoax Confirmed?]() · [Socorro’s famous UFO sighting]() ### The tourist at the gas station One stranger may have seen it too. Opal Grinder, who ran a service station on the highway, told the Chieftain that a tourist pulling in for gas that evening remarked that aircraft flew low around here. Something had passed right over his car heading for the hills, he said—a “funny looking helicopter, if that’s what it was”—and he had seen a police car going up after it. Hynek checked the timing: Grinder’s wife had been leaving to reach the bank before its six o’clock closing, which fits. The tourist drove on toward wherever he was going, and the Air Force never found him. Sources: [The 1964 Socorro UFO Incident]() · [Death of a Legend]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() ### The case that would not leave Socorro The town made its peace with the saucer in stages. In 1965 a producer offered to hold the premiere of a film about the landing in Socorro for $25,000; the mayor declined. In 1966 the Chamber of Commerce built stone steps, a rock walkway, and benches at the landing site for visitors—about a quarter mile east of where anything had happened. The right spot was still bare, local historian Paul Harden wrote, and “people were spooked that the area might be radioactive.” A few weeks after the sighting, reports of shadowy figures with mysterious round lights in the hills turned out to be a Bureau of Land Management survey crew. In 2012 the city commissioned a mural. Nothing of the object was ever recovered from the real arroyo. Sources: [The 1964 Socorro UFO Incident]() ### What remains in the dust A man nobody thought capable of inventing it reported an egg on legs, two small figures in white, a flame that burned brush without blasting the sand, and a red sign that the authorities asked him to keep to himself. The Air Force looked for the machine in every hangar it could think of and gave up. If it was a prank, the pranksters kept a secret for sixty years that would have made them famous. If it was a test vehicle, no program has ever claimed it. And if the startled figure by the arroyo really did turn to look at the patrol car—what, for those two seconds, did it make of Lonnie Zamora? Sources: [The Investigation of UFOs — “Policeman’s Report” and “Diagnosis: Unsolved”]() · [Officer Lonnie Zamora’s report]() ## The evidence ### The strongest record The central evidence is documentary: the statement Holder and Byrnes took on the night, FBI teletypes and memos, Chavez’s observations, Air Force field reports, maps, site photographs, laboratory summaries, radio interviews recorded within days, local newspaper reporting, and the Blue Book control record. The 168-page file preserves the investigation’s breadth and its contradictions. It records what witnesses and investigators said and did, not a sensor’s view of the object. Sources: [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() · [Officer Lonnie Zamora’s report]() · [FBI documents on the Socorro landing report]() · [Sanitized Project Blue Book case files, 1947–1969]() ### One direct witness Zamora is the only identified person who reported the object at close range. Chavez arrived after it had gone, and Lopez’s window faced the wrong way. The gas-station tourist was never located; later claimed witnesses are indirect or distant. Zamora’s own account also varies by audience: two “people” in the statement taken that night, “something white” on the radio, and nothing about figures at all in what Hynek said Zamora first told him. Everything depends on one officer’s prompt and restrained testimony—which is exactly what persuaded Quintanilla and Hynek to take it seriously. Sources: [Officer Lonnie Zamora’s report]() · [Lonnie Zamora and J. Allen Hynek radio interviews]() · [The Investigation of UFOs — “Policeman’s Report” and “Diagnosis: Unsolved”]() ### What the traces can and cannot show Photographs and measurements document disturbed soil and charred vegetation within hours of the report. They carry no signature of what made them, and sources disagree on whether the brush was hot. Laboratory work found no foreign material or propellant residue, radiation was normal, the fused-sand story has no support in the file, and sightseers destroyed the site within two days. Sources: [FBI documents on the Socorro landing report]() · [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() · [Socorro, Fused Sand and Mary Mayes]() ### An official unknown Blue Book’s “unidentified” meant that the data did not correlate with any known object or phenomenon; Quintanilla’s “Diagnosis: Unsolved” says the same. The Air Force maintained that none of its unidentified cases demonstrated technology beyond contemporary science. Sources: [The Investigation of UFOs — “Policeman’s Report” and “Diagnosis: Unsolved”]() · [Project BLUE BOOK — records and Air Force fact sheet]() ### Classification This file is classified as an unresolved daylight close encounter with reported occupants and physical traces. The student-prank hypothesis has a university president’s word behind it but no participant or mechanism; aerospace and balloon proposals each explain part of the report and fail on the rest. No public evidence closes the case. Sources: [Famous Socorro ‘UFO Landing’ a Student Prank?]() · [A Socorro Student Hoax Confirmed?]() · [Lonnie Zamora and the Socorro UFO]() ## Timeline - **24 APR 1964 · ABOUT 5:45 PM:** Zamora breaks off a traffic pursuit after hearing a roar and seeing a blue-orange flame descending southwest of Socorro. - **24 APR · MINUTES LATER:** From a mesa road he sees a white oval and two small figures in white, radios a possible wreck, then runs as a rising roar and flame begin beneath the object. - **24 APR · DEPARTURE:** The object lifts to car height, goes silent, skims past the dynamite shack, and disappears toward the mountains. “It looks like a balloon,” Zamora radios. - **24 APR · EVENING:** Sgt. Sam Chavez and local officers inspect depressions and burning brush; Capt. Richard Holder and FBI agent Arthur Byrnes Jr. take Zamora’s statement. - **25–26 APR 1964:** El Defensor Chieftain staff photograph the site; by Sunday afternoon hundreds of sightseers have trampled it. - **26–29 APR 1964:** Air Force investigators and J. Allen Hynek conduct interviews, measurements, radiation checks, and operational inquiries. Zamora and Hynek speak on local radio. - **28 APR 1964:** El Defensor Chieftain publishes “Evidence of UFO Landing Here Observed,” including the gas-station tourist’s remark. - **1964 · PROJECT BLUE BOOK REVIEW:** Aircraft, helicopter, balloon, missile-range, radar, soil, vegetation, radiation, and lunar-vehicle leads all fail; the case is classified unidentified. - **29 APR 1965:** Hynek writes to Donald Menzel that he and Quintanilla “find it impossible to dismiss as a hoax.” - **1965–1968:** New Mexico Tech president Stirling Colgate notes to Linus Pauling that he has an indication of the student who engineered a hoax; the note’s date is disputed. - **1966:** Quintanilla discusses Socorro in Studies in Intelligence under “Diagnosis: Unsolved.” The Chamber of Commerce builds a visitor site a quarter mile from the real one. - **2 NOV 2009:** Lonnie Zamora dies in Socorro at age 76, after decades of largely avoiding public discussion of the encounter. - **2012:** Colgate describes the alleged hoax by email as “a candle in a balloon.” Socorro commissions a public mural of the landing. ## Sources & interviews - [Project Blue Book report: Socorro, New Mexico, 24 April 1964]() — U.S. Air Force · 168-page official case file · Public domain via Wikimedia Commons - [Officer Lonnie Zamora’s report]() — Statement taken by Capt. Richard Holder and FBI agent Arthur Byrnes · April 24–25, 1964 · Project Blue Book file, transcribed by NICAP - [FBI documents on the Socorro landing report]() — Federal Bureau of Investigation, Albuquerque · April–May 1964 · Scans hosted by NICAP - [Lonnie Zamora and J. Allen Hynek radio interviews]() — KSRC / Walter Shrode and NICAP / Streeter Stuart · April 1964 · Transcript and archival audio links - [Death of a Legend]() — Saturday Night Uforia · 2009 · Reproduces Hynek’s April 29, 1965, letter to Donald Menzel - [The Investigation of UFOs — “Policeman’s Report” and “Diagnosis: Unsolved”]() — Hector Quintanilla Jr. · Studies in Intelligence · 1966 · CIA release - [The 1964 Socorro UFO Incident]() — Paul Harden · El Defensor Chieftain / Socorro County Historical Society · August 2, 2008 · Includes 1964 reporting - [Obituary: Lonnie Zamora]() — Mountain Mail, Socorro · November 2009 - [Famous Socorro ‘UFO Landing’ a Student Prank?]() — Robert Sheaffer · Skeptical Inquirer · March/April 2010 · Hoax hypothesis and limitations - [A Socorro Student Hoax Confirmed?]() — Robert Sheaffer · Bad UFOs · August 12, 2012 · Colgate’s emails and their limits - [A Final Analysis of the Socorro Symbol]() — Kevin Randle · A Different Perspective · November 6, 2016 - [Socorro, Fused Sand and Mary Mayes]() — Kevin Randle · A Different Perspective · December 20, 2017 - [Lonnie Zamora and the Socorro UFO]() — Brian Dunning · Skeptoid \#582 · August 1, 2017 · Skeptical analysis - [Socorro’s famous UFO sighting]() — Dave Thomas · El Defensor Chieftain · August 11, 2026 · Hoax hypothesis revisited - [Sanitized Project Blue Book case files, 1947–1969]() — U.S. National Archives · Record Group 341 · NAID 597821 - [Project BLUE BOOK — records and Air Force fact sheet]() — U.S. National Archives · Official collection guide - [Lonnie Zamora incident]() — Wikipedia · Orientation and reference trail · Consulted September 16, 2026 Spotted an error, or know a better source? Write to hello@uap.fun. ## Connected files - [The Levelland Night]() — Seven years earlier and one state over: glowing eggs on the road, and an Air Force answer Hynek came to regret. - [Rendlesham Forest]() — Another uniformed witness in the dark, and another set of shallow depressions in the ground the morning after. - [J. Allen Hynek]() — Socorro was the case Blue Book’s house skeptic could not talk himself out of. - [Project Blue Book]() — What “unidentified” meant inside the Air Force’s UFO project. - [The kinds of close encounters]() — Hynek’s scale, in which Zamora’s two figures make Socorro a third-kind report. ## A NOTE ON EVIDENCE Unidentified describes a limit of the available information. It doesn’t identify an origin. [NEXT CASE FILE: The Levelland Night]()