The Mexican Congress UAP Hearing

Theoretical Alignment

This file substitutes "Fabrication / Hoax" for the Psycho-Social/Mundane category because the leading and, in this file's assessment, established explanation is not misperception of a genuine phenomenon but deliberate physical alteration of real human and animal remains to simulate a non-human appearance, a materially different category from the vast majority of cases in this archive, which typically turn on how an observer interpreted something they actually saw rather than on whether a physical object was manufactured to deceive. It retains a token Extraterrestrial weighting only in recognition that this file, like any, cannot claim absolute certainty about a claim's origin without having personally examined the specimens, though that weighting should not be read as reflecting genuine evidentiary ambiguity; it reflects this archive's general epistemic humility rather than any specific unresolved question in this particular case. The Interdimensional weighting is retained for the same archive-wide consistency reason and carries no case-specific evidentiary basis whatsoever.

Background

The hearing was organized by Mexican Congressman Sergio Gutiérrez Luna of the governing Morena party as a public forum, "Audiencia Pública: Fenómenos Aéreos Anómalos No Identificados en México" (Unidentified Anomalous Aerial Phenomena in Mexico), and was livestreamed on the Chamber's YouTube channel. Presenters were sworn in before testifying. Afterward Gutiérrez Luna said, "We are left with reflections, with concerns and with the path to continue talking about this," and that he hoped it would be the first of similar events in Mexico; Congress adopted no position on the claims. The event drew international attention as a rare instance of a national legislature formally receiving UAP testimony, less than two months after the U.S. House Oversight Committee's National Security, the Border, and Foreign Affairs Subcommittee held its own July 26, 2023 hearing in the U.S. Capitol hearing rooms in Washington, featuring David Grusch, Ryan Graves, and David Fravor.

Maussan, born in 1953, has worked as a reporter since 1970, including for Televisa, and has hosted television programs about UFOs for decades; by 2017 he was also producing material with Gaia, a subscription streaming service known for paranormal and pseudoscience programming. Well before the September 2023 hearing, he had a specific, repeated record of presenting purported physical evidence of non-human beings that independent experts rejected. At the 2015 "Be Witness" event in Mexico City he promoted the "Roswell Slides," 1940s-era photographs he suggested showed an alien body linked to Roswell, New Mexico; within days researchers deblurred the museum placard in the image, which read "MUMMIFIED BODY OF TWO YEAR OLD BOY," identifying a preserved human child. The expert he brought to that event to vouch for the body was José de Jesús Zalce Benítez, who also appeared at the 2023 hearing. Maussan had also publicized the so-called "Metepec creature," which turned out to be a skinned monkey, and a 2016 "demon fairy" made from a bat, sticks and epoxy. In 2017 he appeared in Gaia videos presenting a three-fingered "mummy" from near the Nazca Lines. These episodes gave scientists, journalists and skeptics a specific basis, not mere general suspicion, for approaching his 2023 claims with caution.

The hearing also arrived amid a broader, genuinely serious wave of UAP transparency activity in U.S. government and policy circles, including the Pentagon's All-domain Anomaly Resolution Office, established in 2022 to centralize and standardize UAP reporting across the U.S. military, and the ongoing congressional attention that produced the July 2023 House Oversight hearing. That parallel, more institutionally rigorous track record is part of why Maussan's presentation drew the specific criticism it did from serious UAP researchers and advocates such as Ryan Graves: it was seen by many in that community not merely as an unpersuasive claim on its own terms, but as a reputational liability for a broader transparency effort that was, at the same moment, trying to establish its own credibility through exactly the kind of rigorous, institutional process this hearing conspicuously lacked.

Complete Timeline

Date	Event
2015	At the "Be Witness" event in Mexico City, Maussan promotes the "Roswell Slides," with Zalce Benítez as his expert; within days the placard in the photograph is read as "mummified body of two year old boy."
Jan. 2017	French explorer Thierry Jamin announces online that "mummified bodies and organs" were found in southern Peru in January 2016, that he has obtained some, and that they may belong to an unknown or extraterrestrial species; he launches a crowdfunding campaign through his Inkari Cusco Institute.
2017	Maussan later says the two specimens shown to Congress were recovered in 2017 from diatomaceous-earth (algae) mines near Nazca. Grave robber Leandro Rivera has told Reuters that two of his mummies were shown at the Mexican hearings.
June 28, 2017	Paleontologist Rodolfo Salas-Gismondi publicly denounces the "Nazca mummy" as a sham, in an analysis of its hands and feet.
July 8, 2017	Twelve Peruvian and international bio-anthropologists, through the World Congress on Mummy Studies, issue a statement calling the figures "undoubtedly" pre-Columbian human remains "manipulated and even mutilated" for commercial exploitation; on July 11 Maussan and Zalce Benítez present the Nazca finds at a Lima hotel conference.
2017	A report by Peru's prosecutor's office calls the figures promoted by Maussan "recently manufactured dolls, which have been covered with a mixture of paper and synthetic glue to simulate the presence of skin." In October 2019 the Ministry of Culture demands that San Luis Gonzaga National University in Ica hand over related remains it holds.
2022	Peruvian grave robber Leandro Rivera, who says he removed as many as 200 sets of remains from a Nazca-area cave, receives a four-year suspended sentence and a fine of about 20,000 soles (about $5,190) for offenses against public monuments.
Sept. 12, 2023	Jaime Maussan presents two specimens to Mexico's Chamber of Deputies under oath, alongside testimony from José de Jesús Zalce Benítez; Ryan Graves speaks separately on pilot UAP reports.
Sept. 13, 2023	UNAM's laboratory reissues its September 2017 statement that it only radiocarbon-dated a sample and drew no conclusions about its origin; UNAM astronomer Julieta Fierro says details of the figures "made no sense," and astrobiologist Antígona Segura tells the New York Times the conclusions are "simply not backed up by evidence."
Sept. 13, 2023	Ryan Graves publicly criticizes the presentation as "a huge step backwards" and "an unsubstantiated stunt."
Sept. 14, 2023	NASA publicly releases its independent UAP study team's final report and names Mark McInerney as the agency's first director of UAP research, two days after the Mexican hearing.
Sept. 2023 (following days)	Skeptic writers, including Brian Dunning, publish analyses arguing the figures match earlier Nazca specimens shown to have removed fingers and skulls replaced with modified llama braincases, coated in a white substance.
Oct. 2023	Peruvian customs agents seize three-fingered figures dressed in Andean clothing in a box at DHL's Lima offices, reportedly bound for a Mexican citizen.
Nov. 7, 2023	Maussan returns to Mexico's Congress with a panel of Peruvian doctors for a second hearing of more than three hours; Dr. Daniel Mendoza presents X-rays of a "non-human being," and anthropologist Roger Zúñiga of San Luis Gonzaga National University says "They're real" and that there was "absolutely no human intervention" in their formation. Maussan concedes: "None of the scientists say [the study results] prove that they are extraterrestrials, but I go further."
Jan. 12, 2024	At a Ministry of Culture press conference, forensic archaeologist Flavio Estrada of Peru's Institute of Legal Medicine says the figures seized in Lima are dolls assembled from animal bones with modern synthetic glue; the team does not tie them to the bodies shown in Mexico, but says those are not extraterrestrial either.
Nov. 9, 2024	Peruvian Congressman Germán Tacuri hosts a public hearing in Peru's Congress, "Seres Tridigitales de Nazca," with Maussan among the speakers.

The Presentation

Maussan displayed the two specimens in glass cases, describing them as about 1,000 years old on the strength of UNAM's carbon dating. (A different presenter in a circulating video put the figures at 700 to 1,800 years old.) He described elongated heads, three fingers per hand, no teeth, large brains and big eyes that "allowed for a wide stereoscopic vision," and said X-rays showed that one of the beings had "eggs" inside it. José de Jesús Zalce Benítez, director of the Scientific Institute for Health of the Mexican Navy, said X-rays, 3-D reconstruction and DNA analysis had been carried out, and told the committee, "I can affirm that these bodies have no relation to human beings." Maussan testified under oath that the remains were not mummies and had not been manipulated, and that they were "non-human beings that are not part of our terrestrial evolution." Congressman Gutiérrez Luna, presiding, administered the oath to each presenter but made clear that the chamber was not endorsing any conclusion, a distinction widely lost on the hearing's international audience.

No vote or resolution followed from the hearing, and Congress adopted no official position on the claims presented.

The Retraction: What UNAM Actually Said

UNAM's response is one of the case's most important pieces of evidence. Its mass-spectrometry laboratory reissued a September 2017 statement saying it had only radiocarbon-dated a sample sent to it, that it drew no conclusions about the sample's origin, and that it performed no other kind of test; it also distanced itself from any later use, interpretation or misrepresentation of its results. The gap between what UNAM actually did (date a piece of organic material) and what the hearing implied it had done (validate a non-human origin) is a textbook example of an institutional citation being used to imply far more endorsement than was given.

UNAM researchers went further than a procedural clarification. Antígona Segura, an astrobiologist at UNAM's Institute of Nuclear Sciences, told the New York Times, "These conclusions are simply not backed up by evidence," adding, "The whole thing is very shameful." Julieta Fierro, a researcher at UNAM's Institute of Astronomy and one of Mexico's best-known science communicators, said many details about the figures "made no sense," that the university had not endorsed Maussan's claims, and that Maussan "says he has talked to the Virgin of Guadalupe." That two senior scientists from the institution Maussan cited publicly rejected his conclusions within a day is independent evidence, separate from UNAM's institutional statement.

The Peru Forensic Finding

The most consequential evidence in this case comes from Peru, and its roots predate the 2023 hearing by more than six years. In January 2017 the French explorer Thierry Jamin announced online that "mummified bodies and organs" had been found in southern Peru a year earlier, that he had obtained some of them, and that they might be "biological relics belonging to unknown terrestrial species or species from outside our planet"; his Inkari Cusco Institute ran a crowdfunding campaign around them, and Maussan's Gaia videos presented a three-fingered "mummy" from the same source. Analyses of those earlier figures found real but altered skeletal material: removed fingers, skulls replaced with modified llama braincases, and a white coating that disguised the tampering. A 2021 CT study cited by Snopes described the head of one small body as "largely made of a deteriorated llama braincase and other unidentified bones."

The scientific rejection of the figures was immediate and came years before Maussan's Congressional appearance. On June 28, 2017, paleontologist Rodolfo Salas-Gismondi publicly denounced the "alien mummy of Nasca" as a sham. Ten days later, on July 8, 2017, twelve Peruvian and international bio-anthropologists and specialists in human remains issued a statement through the World Congress on Mummy Studies calling the figures "undoubtedly" pre-Columbian human remains "manipulated and even mutilated to obtain an 'ad hoc' appearance for commercial exploitation," and condemning the practice as "criminal abuse." A 2017 report by Peru's prosecutor's office went further, calling the figures promoted by Maussan "recently manufactured dolls, which have been covered with a mixture of paper and synthetic glue to simulate the presence of skin." By September 2023, then, the class of object Maussan presented had already been examined and rejected by specialists six years earlier, though, as Euronews noted, it is unclear whether the 2017 bodies are the same ones shown in Mexico.

The Peruvian state's forensic work reached a similar conclusion through a separate channel. In October 2023 customs agents found three-fingered figures dressed in traditional Andean clothing in a cardboard box at the Lima offices of the courier DHL, reportedly bound for a Mexican citizen. On January 12, 2024, at a press conference organized by the Ministry of Culture, forensic archaeologist Flavio Estrada of Peru's Institute of Legal Medicine and Forensic Sciences presented the analysis of those figures. His team did not tie them to the two bodies shown in Mexico, but said those were not extraterrestrial either.

"They are not extraterrestrials, they are not intraterrestrials, they are not a new species, they are not hybrids." The figures, he said, were dolls assembled from animal bones from this planet with modern synthetic glue. — Flavio Estrada, forensic archaeologist, Peru's Institute of Legal Medicine, January 2024

No independent laboratory has published DNA or isotopic results on the two bodies shown in Mexico. The only DNA claims came from Zalce Benítez and the hearing's own presenters, without published methodology or raw data. Reuters reported in 2024 that the Culture Ministry's prosecutor investigation of the looting case found two altered bodies and two partial sets of bones.

Leslie Urteaga, then Peru's Minister of Culture, said in September 2023 that no scientific institution in Peru had identified the remains as non-human, and questioned how the specimens had left the country, since Peruvian law restricts the export of archaeological remains.

The Looting Economy Behind the Specimens

Thierry Jamin is a French explorer long active in Peru who spent years searching the Amazon for the lost Inca city of Paititi; in 2013 he claimed to have found the tomb of the Inca emperor Pachacutec at Machu Picchu, a claim Peruvian archaeological authorities criticized. At the November 2023 hearing he appeared alongside Maussan, introduced as a researcher of the Inkari institute. Reuters reporting in 2023–24 tied the supply of "alien mummy" material to a broader grave-robbing economy in the Nazca and Ica regions, where centuries-old cemeteries containing genuinely ancient remains, some with pre-Columbian cranial modification (a well-documented Andean practice of binding infants' skulls), have long been targeted by looters. Convicted grave robber Leandro Rivera told Reuters he had removed as many as 200 sets of remains from a single cave near Nazca, that some were smuggled to France, Spain and Russia, and that two of his mummies were the ones shown in Mexico; Reuters could not verify key details. Rivera received a four-year suspended sentence and a fine of about 20,000 soles (about $5,190) in 2022 for offenses against public monuments. Evelyn Centurion, head of cultural-heritage recovery at Peru's Ministry of Culture, said, "The looting has not stopped," and that the ministry needed "greater collaboration from local governments and local authorities." Officials now seize 4 to 10 items a year at airports, compared with about 200 a month in 2008, while Peru shares 27 border crossings with five countries. A real looting economy, in which authentic remains are marketed to buyers primed by "ancient alien" media, is important context for how figures of this kind could reach a Mexican congressional hearing.

The legal fallout continued well past the 2023 hearing. Peruvian authorities opened a criminal inquiry into how the specimens left the country, and researchers at San Luis Gonzaga National University in Ica, who hold four more sets of related remains, have refused to hand them over to the Ministry of Culture, which first demanded them in October 2019.

This file treats the cumulative Peruvian record — the 2017 specialist and prosecutor findings, the 2024 state forensic conclusion on related figures, and the ongoing heritage-trafficking investigations — as the strongest category of evidence in the case, with the caveat that no Peruvian or independent forensic report has been published on the two specific bodies shown in Mexico.

Other Voices, Earlier Warnings and the Presenters' Wider Record

The September hearing was not only about the bodies. Harvard astronomer Avi Loeb also spoke, describing his Galileo Project, launched in 2021 to look for physical traces of extraterrestrial technology, and the session included videos of Mexican pilots describing fast-moving objects. Snopes noted that a separate circulating video featured Jois Mantilla, a "journalist and investigator from Otromundo Comunicaciones," who claimed analyses showed the bodies did not "match any Earth species" and dated them to between 700 and 1,800 years old. Neither the chamber nor any independent body endorsed those figures.

The warnings about the Nazca figures had been public since 2017. Besides the World Congress on Mummy Studies statement, American archaeologist Carl Feagans called the find a hoax on July 13, 2017, and on August 3, 2017 University of Kansas anthropologists John Hoopes and Jennifer Raff called the project pseudoscientific and criticized its disregard for Indigenous peoples. Brian Dunning, citing a 2018 Live Science report, notes that the earlier bodies came from tomb robbers led by a man called "Mario," a looter known to Peruvian police for more than 25 years, and that a Russian presented as the group's lead scientist claimed university affiliations that proved false. Whether the two bodies shown in Mexico came from the same source is not known.

Graves's own position also shifted. After his statement calling the event a stunt, Dunning reports, Graves tweeted that he had in fact known about Maussan's history before the hearing but chose to share the stage anyway, then deleted the tweet. Zalce Benítez, for his part, had joined Maussan in 2020 in promoting "Hydrotene," a product its backers claimed was 96 percent effective against viral diseases including COVID-19; a Senate forum on it, organized by a Morena senator, was cancelled after public backlash, and the scientific community does not recognize it as a treatment.

Reuters' reporting on the looting trade adds the medical and legal context. Guido Lombardi, a physician and anthropologist at Cayetano Heredia University who studies mummies, said he had received WhatsApp offers of looted items and that believers in the alien theory were generating a market: "There were no people who were born like this." Penn State historian Christopher Heaney, who has written on Peruvian mummies, said, "Peru has done a lot of work to try and control this trade." Seizures show its range: in February 2022 DHL workers at Lima's airport intercepted a human skull hidden in resin and bound for the United States, and in February 2023 police stopped a mummy headed for Bolivia in a motorcycle courier's backpack. Rolando Mallaupoma, an archaeology analyst in the ministry's recovery unit, said most airport cases involve tourists who claim not to have known the rules, so no criminal case follows.

International Reaction and the Scientific Community's Response

Beyond UNAM's own researchers, the hearing drew swift criticism from scientists elsewhere. Rafael Bojalil-Parra of the Metropolitan Autonomous University called the claims "complete nonsense" (Live Science), and NASA's UAP study team, asked about the Mexican presentation, also questioned its legitimacy. Peru's Culture Minister questioned how the specimens had been taken out of the country.

The timing of NASA's own, far more methodical UAP effort threw the Mexican hearing's approach into particularly stark relief: two days after Maussan's testimony, on September 14, 2023, NASA publicly released the final report of its independent UAP study team and simultaneously named Mark McInerney — previously the agency's liaison to the U.S. Department of Defense on UAP-related matters — as its first director of UAP research, explicitly framing the effort around transparency, standardized data collection, and application of the scientific method to unexplained aerial phenomena. Commentators repeatedly drew the contrast between that process, built on institutional review and instrumented data, and a congressional hearing built around sealed glass display cases and testimonial assurances. This file treats the near-simultaneous timing of the two events, though coincidental, as a useful illustration of the gap between credible institutional UAP research and the presentation this case documents.

Media reception outside the scientific community was, if anything, less charitable. Snopes moved within a day to catalogue what had and had not been established, and outlets from Newsweek to Forbes framed the presentation through Maussan's prior debunked claims. Images of the two specimens spread rapidly on social media as an object of mockery and became an internet meme — noted here not because ridicule is evidence, but because it shows how quickly the specimens' authenticity was doubted outside any formal scientific channel.

Ryan Graves' repudiation carried particular weight because of his own recent testimony: he had appeared before the U.S. House Oversight Committee's National Security Subcommittee on July 26, 2023, alongside David Grusch and David Fravor, in a hearing focused on military UAP encounters rather than physical specimens. Graves said he had accepted the Mexican invitation "hoping to keep up the momentum of government interest in pilot experiences" with UAP, and that his testimony centered on reports from aircrew through his group, Americans for Safe Aerospace. The day after the hearing he wrote on X: "Unfortunately, yesterday's demonstration was a huge step backwards for this issue... I am deeply disappointed by this unsubstantiated stunt."

The November 2023 Hearing and Continuing Fallout

Rather than the matter ending with UNAM's statement and the initial wave of criticism, Maussan returned to Mexico's Chamber of Deputies on November 7, 2023 — less than three weeks after Hurricane Otis devastated Acapulco, as Euronews noted — for a second hearing that ran more than three hours, with a group of Peruvian doctors. Dr. Daniel Mendoza presented photographs and X-rays of what he called a "non-human being," and Maussan called it a "new species" because it appeared to lack lungs and ribs. The doctors presented the remains as once-living organisms and potential evidence of non-human life while declining to certify that they were extraterrestrial; Maussan acknowledged the gap: "None of the scientists say [the study results] prove that they are extraterrestrials, but I go further." Thierry Jamin also appeared, introduced under the name "Thierre Maurice Pierre."

One of the presenters was anthropologist Roger Zúñiga of San Luis Gonzaga National University in Ica, whose institution holds several related specimens. He backed the presenters: "They're real," he said, adding that "there was absolutely no human intervention in the physical and biological formation of these beings," and he presented a letter from 11 university researchers calling the bodies non-human, though not extraterrestrial. Argentine surgeon Celestino Adolfo Piotto suggested the bodies were an evolved version of modern humans. Two months later Peru's state forensic team reached the opposite conclusion about the figures seized in Lima.

The case's fallout extended into Peruvian cultural-heritage enforcement through 2024. Peru's Ministry of Culture pursued the question of how the specimens had been exported, and continued to press San Luis Gonzaga National University to hand over related remains. Officials said in 2024 that a ministry task force with police, the attorney general and the foreign ministry was working to toughen penalties for trafficking.

Peru's Own Congressional Hearing, 2024

The Mexican hearing's influence circled back to Peru. Peruvian Congressmen Germán Tacuri, of the Bloque Magisterial and a member of Congress's Culture Commission, and Paul Gutiérrez traveled to Mexico City for a related UFO event, drawing criticism at home for missing plenary sessions. On November 9, 2024, Tacuri hosted a public hearing of the Culture Commission in Peru's Congress titled "Seres Tridigitales de Nazca," with Maussan among the speakers; Tacuri said he hoped to build a tourism corridor through Ica and Nazca where the beings could be exhibited. The Commission's own report says the presentations covered two positions on the mummies' authenticity and concluded that rigorous scientific research was needed. The hearing produced no new scientific findings. This file treats it as evidence that the claim's persistence depends less on unresolved scientific uncertainty than on its continued ability to attract political sponsors.

Key Figures

The individuals below span the full range of this case's credibility spectrum, from the presenter whose professional reputation rests on this and similar claims, through co-presenters of varying independence, to the scientists and forensic specialists whose work ultimately determined the case's outcome. Reading their occupational backgrounds side by side is, in this file's assessment, nearly as informative as reading the forensic findings themselves.

The Five Observables Assessment

This case does not describe an observed craft or aerial phenomenon, and the Five Observables framework — anti-gravity lift, sudden and instantaneous acceleration, hypersonic velocity without a discernible propulsion signature, low observability, and trans-medium travel — does not meaningfully apply to a claimed physical specimen sitting in a display case. This file notes its absence here as itself diagnostic: unlike genuinely disputed sightings in this archive, where the central evidentiary question is typically what a sensor, camera, or set of trained eyewitnesses actually recorded, this case presents no anomalous flight behavior, radar return, gun-camera footage, or performance characteristic of any kind to evaluate. The entire evidentiary weight instead falls on a single, narrower, and in principle far more answerable question: what are these two objects physically made of, and how did they come to look the way they do? That question, unlike a fleeting aerial encounter, is directly and repeatedly testable by forensic examination — which is precisely what happened, and precisely why this case was capable of being conclusively resolved in a way most sighting-based cases in this archive are not.

Evidence Assessment

Why "Debunked"

This case is rated Debunked because Peruvian forensic authorities and specialists have repeatedly examined figures from the same Nazca trade and found them to be manipulated human remains or dolls made from animal bones and modern glue, and because the scientific institution cited as validating the claim (UNAM) publicly denied doing so, with two of its own senior researchers rejecting the conclusions. No independent forensic report on the two specific bodies shown in Mexico has been published; the rating rests on the specimens' documented source, the presenters' own lack of independent data, and the repudiated citation, which together go well beyond the unresolved skepticism that keeps most cases at Disputed.

The rating is further reinforced by the fact that the forensic conclusion was not a single finding produced under pressure after the hearing. Specialists writing through the World Congress on Mummy Studies, and Peru's prosecutor's office, had already rejected this category of figure in 2017, more than six years before Maussan's Congressional testimony, and Peru's Institute of Legal Medicine reached a similar conclusion about seized figures in 2024. A claim already examined and rejected by relevant specialists, presented again years later to a legislature as though newly validated, is about as complete an evidentiary record as this archive is likely to have for a Debunked rating.

This file also weighs Jaime Maussan's extensive prior track record of promoting since-debunked claims, the fact that a credible, independently credentialed UAP advocate present at the same hearing immediately and publicly disavowed the presentation, and the subsequent Peruvian legal and cultural-heritage proceedings against individuals connected to the specimens' export, as corroborating rather than merely circumstantial evidence.

It is worth being precise about what "Debunked" does and does not mean in this specific case, since the underlying facts have several distinct layers that are easy to conflate. It does not mean the hearing did not happen, that Maussan did not sincerely believe or was not sincerely representing what he presented, or that the specimens contained no genuine archaeological material at all — all three of those things are true. It means specifically that the central claim actually advanced at the hearing, that the specimens constituted physical evidence of a non-human biological organism, has been directly and repeatedly contradicted by every independent forensic and scientific body that has examined the underlying material, across two separate countries and two separate years, with no comparably credentialed body reaching the opposite conclusion. Those are different questions, and this file's rating addresses only the second one.

Observer Credibility & Occupational Profile

This case presents an unusually clear credibility split: Jaime Maussan, the central witness, has a decades-long media career but also a specific, repeated pattern of promoting claims later debunked; his co-presenter, José de Jesús Zalce Benítez, had vouched for the 2015 "Roswell Slides" body, and the doctors at the November 2023 hearing declined to go as far as Maussan's extraterrestrial framing. By contrast, Ryan Graves, a former Navy pilot with a record of sober UAP advocacy who had recently testified before the U.S. House Oversight Committee, was present at the same hearing and publicly rejected the presentation the next day, a rare instance in this archive of one witness at an event publicly contradicting another.

The occupational profile of the case's scientific critics is similarly relevant: Antígona Segura and Julieta Fierro are career research scientists at UNAM in astrobiology and astronomy, not commentators with a general skeptical brand, and Flavio Estrada's conclusion was produced through Peru's state legal-medicine apparatus. Weighed against a presenter whose professional identity is built around promoting this category of claim, and a co-presenter with a personal history in a prior hoax, the balance of occupational credibility runs heavily against the hearing's central claim.

Historical Precedents & Archive Matches

This case fits a recurring pattern in Jaime Maussan's career, matching prior incidents in this archive including his role in the 1991 Mexico City Eclipse UFO Wave and reflecting the same promotional pattern behind the 2015 "Roswell Slides" and "Metepec creature" hoaxes described in his key-figures profile. The specific mechanism at work here — taking genuine archaeological or biological material, physically altering it, and re-presenting it through a credentialed-seeming intermediary as evidence of the non-human — also echoes a broader historical pattern of "alien body" hoaxes reaching back decades, in which a claim's persuasive power tends to rest less on the physical evidence itself than on the perceived authority of whoever is standing next to it. This case is unusual within that broader pattern chiefly for how quickly and how completely that borrowed authority (UNAM's carbon-dating work) was publicly and specifically withdrawn by the institution itself.

The case also sits within this archive's broader coverage of the "ancient astronaut" tradition, which has for decades sought physical or archaeological corroboration for extraterrestrial contact in the human past, from claimed anomalous artifacts to reinterpreted ancient iconography. What distinguishes this case from most entries in that tradition is that it did not rest on reinterpreting an already-known archaeological object or historical account; it involved the physical creation of a new one, assembled specifically to be presented as evidence, which is why this file classifies it as Fabrication/Hoax rather than as a Psycho-Social or interpretive-disagreement case.

Material Analysis

The two specimens presented to Congress were physical objects, unlike most testimonial cases in this archive, which makes the central question in principle forensically answerable. So far the only examinations of those two bodies were arranged by the presenters themselves. Peru's Institute of Legal Medicine has examined related figures from the same trade — skeletal identification, analysis of the binding agent, and comparison with known human and animal anatomy — through a state forensic body with legal authority and chain-of-custody obligations, independent of Maussan's team and of UNAM's radiocarbon lab.

The Conventional Explanation Candidates (CEC)

This section evaluates each candidate conventional explanation for the specimens against the available evidence, in descending order of evidentiary support.

Candidate 1: Manufactured Composite Specimens from Altered Human and Animal Remains

The leading, and this file's assessed, conventional explanation is that the presented specimens were deliberately manufactured objects: genuine skeletal material, much of it looted from burial sites in the Nazca region, physically altered (fingers removed, skulls replaced with modified llama braincases in earlier examples) and coated or bound with a modern synthetic material to simulate a non-human appearance. This is not a single-source claim. Twelve specialists writing through the World Congress on Mummy Studies and Peru's prosecutor's office rejected earlier figures in 2017, and Peru's Institute of Legal Medicine, through Flavio Estrada, reached the same kind of conclusion about seized figures in January 2024. The caveat is that no independent report on the two specific bodies shown in Mexico has been published.

Candidate 2: Genuine, Unmodified Pre-Hispanic Human Remains Bearing Cranial Modification

A secondary explanation is that some of the related specimens are simply ancient human remains, potentially bearing authentic pre-Columbian cranial modification, a well-documented Andean practice unrelated to any extraterrestrial explanation; the 2017 specialists' statement described the earlier figures as pre-Columbian human remains that had been manipulated and mutilated. Genuine cranially modified mummies are a known category of Peruvian archaeological material and may explain why some looted material struck buyers as anomalous-looking. On its own, though, this candidate does not account for the three-fingered hands and other features that analyses of earlier figures attributed to deliberate alteration.

Candidate 3: Extraterrestrial or Otherwise Non-Human Biological Origin

This candidate is the one Maussan himself advanced, and the forensic record contradicts it: Estrada said the bodies shown in Mexico were "not extraterrestrials," "not intraterrestrials," "not a new species," and "not hybrids." No independent, credentialed laboratory has published DNA or isotopic data supporting a non-human or unknown-species origin; the only DNA claims offered publicly came from José de Jesús Zalce Benítez, the expert behind the 2015 "Roswell Slides" identification, with no published methodology or dataset. This file assigns this candidate no meaningful evidentiary support.

A Documented Pattern, Not an Isolated Incident

The leading candidate explanation is strengthened by Maussan's prior promotion of a mummified human child as an alien in 2015 and of the Nazca figures since 2017, with the same co-presenter, José de Jesús Zalce Benítez, involved in both. It is strengthened further by a documented looting pipeline (Thierry Jamin's 2017 promotion of the Nazca finds and convicted looter Leandro Rivera's admitted removal of as many as 200 sets of remains from a single Nazca cave, two of which he says were shown in Mexico) that supplies exactly the raw material this candidate requires.

What Would Change This Assessment

Consistent with this archive's general practice of stating what evidence would be capable of overturning a rating, this file notes specifically what would be required to revisit the Debunked classification: independent, peer-reviewed genomic sequencing of the actual specimens presented to Congress (not related but distinct material), conducted by a laboratory with no financial or promotional relationship to Maussan, Zalce Benítez or Jamin, published with full methodology and raw data available for outside replication, and reconciled with the Peruvian forensic findings on related figures. Absent that, the existing record stands as this file's basis for classification.

Applying the Extraordinary-Evidence Standard

Carl Sagan's often-cited formulation that extraordinary claims require extraordinary evidence is a useful, if informal, standard against which to weigh this specific case. A genuine discovery of a non-human biological organism would be, by any measure, one of the most significant scientific findings in human history, and the ordinary path for validating such a finding runs through peer-reviewed publication, independent replication by multiple unaffiliated laboratories, open access to samples for outside researchers, and transparent, reproducible methodology — not a single legislative hearing built around sealed display cases, a presenter with a direct financial and professional interest in the outcome, and a scientific validator who had personally participated in an earlier, materially identical hoax. No such peer-reviewed publication, independent replication, or open sample access has occurred in connection with this case. Judged against that standard, the presentation did not fail to meet an unreasonably high bar; it did not attempt to meet the ordinary bar science applies to any claimed discovery of comparable magnitude.

Manufactured Composite Specimens from Altered Human/Animal Remains — Plausibility Rating: CONFIRMED BY INDEPENDENT FORENSIC INVESTIGATION

Related Cases

Further Reading — Recommended Literature

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Essential Viewing

Sources

• "'Alien Corpses' Revealed in Hearing Before Mexican Congress," Snopes. Read online →
• "Alleged Alien Corpses Displayed to Mexican Congress Did Not Convince Scientists," Smithsonian Magazine. Read online →
• "Aliens In Mexico? Not So Fast—Presenters Have History Of Being Debunked," Forbes. Read online →
• "The Alien Mummies Presented to Mexico's Congress," Brian Dunning, Substack. Read online →
• "UFO Whistleblower Balks at Claim: 'Alien Corpses' Revealed in Mexico Called 'Unsubstantiated Stunt,'" Fox News. Read online →
• "'Alien Bodies' Presented in Mexican Congress Panned as 'Stunt,'" KSL.com. Read online →
• "Have 'Alien' Bodies Shown in Mexico Already Been Debunked? What to Know," Newsweek. Read online →
• "Mexico Legislators Hold Hearing on Existence of UFOs, Shown 'Alien' Bodies," Al Jazeera. Read online →
• "Mexico 'Alien Bodies': Those Viral Artefacts Get Lab Tests," BBC News. Read online →
• "UFO Expert Presents 'Alien Corpses' in Mexican Congress," Mexico News Daily. Read online →
• "Alien Bodies Mexican Congress Jaime Maussan," Global News. Read online →
• "Controversial Alien Bodies Return to Mexico's Congress as Expert Testifies Again on Discovery," Euronews. Read online →
• Sagan, Carl. The Demon-Haunted World: Science as a Candle in the Dark. Ballantine Books, 1997.
• Peebles, Curtis. Watch the Skies! A Chronicle of the Flying Saucer Myth. Smithsonian Institution Press, 1994.
• Kean, Leslie. UFOs: Generals, Pilots, and Government Officials Go on the Record. Harmony Books, 2010.
• Graff, Garrett M. UFO: The Inside Story of the US Government's Search for Alien Life Here—and Out There. Avid Reader Press, 2023.
• Hynek, J. Allen. The UFO Experience: A Scientific Inquiry. Da Capo Press, 1998 (orig. 1972).
• "File: Palacio Legislativo de San Lázaro obtenido con dron 02.jpg," ProtoplasmaKid, CC BY-SA 4.0. View file →
• Garrison, Cassandra, and Marco Aquino. "Alien fever dreams fuel Peruvian grave robbings," Reuters (republished by Swissinfo), April 2024 (Rivera, Centurion, seizure statistics, San Luis Gonzaga University). swissinfo.ch
• "'Aliens' found in Peru are actually dolls made of bones, forensic experts declare," CBS News / AP, January 2024 (Estrada, DHL seizure). cbsnews.com
• "'They're real': Another UFO session held in Mexican Congress," Mexico News Daily, November 10, 2023 (Zúñiga, Piotto, Maussan's "I go further"). mexiconewsdaily.com
• "'This is complete nonsense': Scientists rail against 'alien' bodies shown before Mexican congress," Live Science, September 2023. livescience.com
• Wikipedia, "Thierry Jamin" and "Jaime Maussan" (pointers for the 2017 World Congress on Mummy Studies statement, Salas-Gismondi, the July 2017 Lima conference, the 2019 Ministry of Culture demand, and the 2017 prosecutor's report). en.wikipedia.org
• Congreso de la República del Perú, Comisión de Cultura, results of the Second Public Hearing ("Momias de Nazca"), November 2024. congreso.gob.pe
• "Tacuri defiende evento sobre 'extraterrestres' en el Congreso," Canal N. canaln.pe
• NASA JPL Horizons, observer ephemeris for the Moon at Mexico City, 2023-09-12. ssd.jpl.nasa.gov

Corrections (October 2026)

A fact-check against Reuters, AP/CBS, Mexico News Daily, Euronews, Smithsonian, Snopes and Brian Dunning's coverage, the Peruvian Congress's own hearing report and the Wikipedia articles on Maussan and Thierry Jamin found several errors in the earlier version of this page. Anthropologist Roger Zúñiga was described as contradicting Maussan's panel; in fact he was one of its presenters and said the bodies were real, with "absolutely no human intervention." The 2017 quotation about "recently manufactured dolls" was attributed to the World Congress on Mummy Studies; it comes from a Peruvian prosecutor's report, while the specialists described the figures as manipulated human remains. The January 2024 forensic finding concerned figures seized at DHL in Lima, not the two bodies shown in Mexico, and claims that Peruvian DNA testing found the material "100 percent human" and that the Culture Minister called the figures assembled pre-Hispanic remains could not be sourced. A "2015 Peru alien mummy" presentation does not exist; the 2015 case was the Roswell Slides, for which Zalce Benítez was Maussan's expert.

Other corrections and removals: quotations attributed to Julieta Fierro ("Of course it was all made up"), Jordan Bimm, Neil deGrasse Tyson, Germán Tacuri and Guido Lombardi, the "Luis Quispe" fabrication role, an Imperial College marmoset identification of the Metepec creature (it was a skinned monkey), the Inkari Cusco Institute's supposed repatriation demand (the institute is Jamin's own), a disrupted "pregnant specimen" press event, and the claim that physical anthropologists judged the anatomy impossible could not be confirmed and were removed. The 700–1,800-year ages came from a different presenter, not Maussan; Graves is a former, not retired, Navy pilot who spoke about aircrew reports; Gutiérrez Luna is described as a Morena deputy rather than bloc coordinator; the Peruvian hearing date (November 9, 2024) was added; and the lunar figure was recomputed with JPL Horizons.