Case file · Retrieval claim

Ubatuba fragments

Metallic fragments from an alleged exploding disc off the Brazilian coast.

1957 CE · -23.43, -45.07 · status: disputed

The account

A modern comparison: in 2024 Oak Ridge National Laboratory tested another magnesium specimen claimed to come from a 1947 UAP crash. It found terrestrial magnesium and lead isotopes and no working terahertz waveguide (see doc-ornl-magnesium-specimen-2024).

The sceptical view

Analyses found unusually pure magnesium; interpretations remain contested.

The researched reading

Real magnesium fragments with no real provenance: an anonymous letter and no witnesses. The metal is ordinary in kind, so the case rests on a story nobody can check.

Explanation	Weight	Why
Undetermined	50%	The share the reading had given to fabrication on doubt rather than evidence: the record does not settle it either way.
A hoax or fabrication	15%	The fragments came with an anonymous, unsigned letter to a newspaper columnist; no fishermen or other witnesses were ever found.
Something known, misidentified	12%	The material is magnesium of terrestrial type; later analysis found impurities, and the Condon study showed commercially produced magnesium could be as pure, so it could be industrial scrap or debris.
Genuinely anomalous	10%	Early Brazilian analysis claimed unusual purity, which ufologists such as James Harder took as evidence of exotic origin; later analyses did not confirm anything outside terrestrial manufacture.
Secret human technology	8%	Debris from a test vehicle or rocket is a possible ordinary source of high-grade magnesium.
A known natural phenomenon	2%	Magnesium does not occur as pure metal in nature.
Perception, memory or mind	2%	There is no witness account to assess.
A poorly understood natural phenomenon	1%	Nothing points to an unusual natural process.

Official position: No official finding; the Condon Report found the magnesium not unusually pure and the provenance unknown.

Connections in the atlas

Sources

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