The materials
Thirteen samples went to the lab. Thirteen came back from Earth.
Metal is the best evidence there could be. A witness can be mistaken and a photograph can be faked, but an alloy is a physical fact with an isotope ratio, and isotope ratios are not a matter of opinion. If a piece of a craft built somewhere else were sitting in a drawer, a mass spectrometer would end this argument in an afternoon.
So the material claims are the ones worth taking most seriously, and the good news is that they have been taken seriously — by exactly the institutions you would want. Fourteen claimed alien materials in this archive were put in front of a government or government-contracted laboratory and actually tested.
Thirteen of the fourteen were identified as ordinary terrestrial matter. The fourteenth was left unidentified — which is not the same thing as alien.
Oak Ridge National Laboratory examined the flagship specimen, a magnesium alloy alleged to be a component of a crashed extraterrestrial vehicle and claimed to work as a terahertz waveguide and to generate antigravity. Terrestrial in origin, said Oak Ridge, and it does neither. A second metallic specimen went to Oak Ridge and came back a conventional aluminium-silicon alloy that has been an industrial staple since the 1970s: no isotopic anomalies, no rare earths. Canada's Project Magnet was handed a genuine fragment by the United States Air Force in 1952, analysed it, and found magnesium orthosilicate — a rock. The FBI laboratory received a substance submitted as flying-saucer material from South Carolina and identified it as powdered soap stones.
The famous materials do worse, not better. Roswell's memory foil, the single most cited object in the field, does not exist: no fragment of it is anywhere on Earth, and what the Army actually recovered and photographed was foil, rubber and balsa. Ubatuba's "impossibly pure" magnesium was not impossibly pure — the Condon Committee found it less pure than the triple-sublimed magnesium Dow Chemical was selling at the time, with entirely ordinary terrestrial isotope ratios, and the chain of custody begins with an anonymous letter to a newspaper columnist. Bob Lazar's element 115 is the one falsifiable claim in the entire canon, and it was tested: the element was synthesised in 2003, it is called moscovium, it survives for a fraction of a second, and it does nothing that was claimed for it.
Which leaves the fourteenth. In 1954, a shower of white-hot metal pellets fell on Woodside, California, started fires, and burned into the pavement. The Air Force put them in front of its own metallurgists, and the file records that the metallurgists were unable to provide any identification. That is the only material in this entire archive that a government laboratory examined and could not name — and it is worth being precise about what that means. It means unidentified. It does not mean extraterrestrial. 1954 California was thick with aerospace test ranges, and an unexplained industrial provenance is still an industrial provenance. But the case is honestly open, and we would rather show you the one that got away than pretend the file is tidier than it is.
Recovered and analysed
A laboratory examined the object and reported what it was.
8 cases
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Oak Ridge National Laboratory — a facility that has been separating isotopes since the Manhattan Project — examined a magnesium alloy alleged to be a component of a crashed extraterrestrial vehicle, claimed to work as a terahertz waveguide and to generate antigravity. Terrestrial in origin. Does neither.
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A metallic specimen, put through chemical assay and spectroscopy at Oak Ridge. A conventional aluminium-silicon alloy, an industrial staple since the 1970s. No isotopic anomalies. No rare earths.
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Project Magnet — Canada ran an official UFO study, and in 1952 the United States Air Force handed it an actual fragment to analyse. It was magnesium orthosilicate, a common terrestrial mineral. Magnet was closed for lack of results.
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The first material ever handed to the United States government as a piece of a flying saucer. The FBI traced it to a Tacoma slag mill.
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A substance submitted to the Bureau as flying-saucer material. The FBI laboratory identified it as powdered soap stones, and recommended returning it to the sender.
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The Brazilian magnesium fragments, and the origin of the phrase "impossibly pure." They were not impossibly pure. The Condon Committee found them less pure than the triple-sublimed magnesium Dow Chemical was selling at the time, with ordinary terrestrial isotope ratios — and the chain of custody begins with an anonymous letter to a newspaper columnist.
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The memory foil that springs back flat: the most famous recovered material in history, and there is not one gram of it anywhere on Earth. What the Army recovered and photographed was foil, rubber and balsa.
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The exception. A shower of white-hot metal pellets fell on a California town, set fires, and burned into the pavement. The Air Force put them in front of its own metallurgists — and the file records that the metallurgists were unable to provide any identification. This is the only material in the entire archive that a government laboratory examined and could not name. It means unidentified. It does not mean alien.
Claimed, never produced
Asserted by a witness, a whistleblower, or a document nobody can authenticate.
5 cases
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The reverse-engineering programme, described to Congress under oath. AARO went looking for it, and its report — which is also in this archive — found that the programme never recovered or reverse-engineered anything, and was disestablished for lack of merit.
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Element 115 is the one falsifiable claim in the entire canon of recovered technology, and it was tested: the element was synthesised in 2003. It is moscovium. It survives for a fraction of a second and it does nothing that was claimed for it.
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Lead beads, gold-silver mesh and vitrified rock, collected on a hillside and said to match no terrestrial alloy. Every claim traces to one Soviet researcher; none was replicated; no sample has left Russia. Dalnegorsk is a lead-and-zinc smelting town.
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The most recent recovered object in the archive, and the pattern is identical to 1947: it is in private hands, its custody is undocumented, and no laboratory willing to stake its name on the result has been allowed near it.
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Shredded tin foil, mailed to the FBI alongside a report of lights. The Bureau declined jurisdiction and never analysed it. Shredded foil, in 1952, is radar chaff.
Came down, left a mark, found nothing
A search happened. It recovered nothing. These cases remain genuinely open.
3 cases
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The most rigorous physical-trace investigation any government has ever run. France's space agency was on the ground within 48 hours; a plant biologist found chlorophyll reduced by a third to a half in a gradient around the site, with soil compaction and heating. It was published in the scientific literature. And it is still only a mark on the ground — nothing was recovered, and a burned patch of soil tells you nothing about where the thing came from.
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A glowing ring of soil that would not absorb water. The white fibres in it — the detail the case is famous for — were identified by a French biologist as an organism of the order Actinomycetales, and fungal mycelium is a well-known cause of exactly that hydrophobia.
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Not a material: an injury. Three people were burned by something over a Texas road, and the physical evidence sits in their medical records. They sued the United States and lost, because nobody could produce the craft.
Why the good samples always go missing
There is a shape to this record that is hard to miss once you have seen it. The materials that survive to be tested are mundane, and the materials that would be extraordinary are always the ones with no chain of custody: destroyed, confiscated, dissolved on handling, retained by a private owner, or in the hands of one researcher in one country who will not release a sample. The Buga sphere, recovered in Colombia in 2025, follows the 1947 pattern exactly — it is real, it is in private hands, its custody is undocumented, and no laboratory that would stake its reputation on the result has been allowed near it.
That is not proof of a cover-up. It is what a claim looks like when there is nothing underneath it, and it is also, inconveniently, what a claim would look like if there were. The way to tell the difference is a sample, a laboratory, and a published number. The offer stands.
Every case is scored by the Alien Proof Index. The craft are handled in crash recovery and the bodies in alien recovery. The laboratory reports themselves are in the disclosure archive.