TRACECAT Case Directory
  Category 6, Physical Traces 
Rating: 5  


The Ubatuba Incident
Early September, 1957
Ubatuba, Brazil

Fran Ridge:
Early September, 1957; Ubatuba, Brazil, Sao Paulo Province
One of the most controversial of all physical -evidence cases. The witness described an event in which a "flying disk" exploded over the beach at Ubatuba. Some of the metal, which had "rained down" from the exploding disk, was collected, and three small pieces were provided. As you can tell, there have been numerous evaluations, all posted in the links below. Paul Hill discussed the results of his analysis. Laboratory analysis of the samples found the magnesium to be not only of exceptional purity, and anomalous in its trace composition of other elements, but 6.7% denser than ordinary pure magnesium, a figure well beyond the experimental error of the measurement. Hill's calculation shows that this observation can be accounted for by assuming that the sample contained only the pure isotope Mg-26, rather than the naturally-occurring distribution among isotopes Mg-24, Mg-25, and Mg-26. Since the only isotope separation on a significant scale in terrestrial manufacture is that of uranium, such a result must be considered at least anomalous, and possibly as evidence for extraterrestrial manufacture

Paul Hill:
In "UFO, The Whole Story", the Lorenzens made one of the most significant comments about the Ubatuba magnesium fragments: "The really strange facet of this particular incident and the subsequent investigations is the fact that three different analyses performed on three different fragments yielded completely different results." Agreed! Yet all of the analysts are probably correct in their physical findings. Anyone experienced in missile development can ex­plain the quoted result. When a supersonic developmental missile fails by disintegration it usually breaks into what looks like hundreds of fragments which seem to fill the sky like confetti. All parts of the vehicle get scrambled together. On reaching Earth they are better shuffled than a deck of cards on the deal. Any complex Earth machine is composed of dozens of metallic alloys, a different alloy for every special purpose. UFOs may well use special purpose materials also. The point is that the differences may be intentional. David Saunders also makes this point. Thus the best overall view of the Ubatuba magnesium fragments is that each one is unique to its special purpose. Fragment 1 was the most intriguing of them all, for according to the tests of some of the world's most experienced metallurgists that fragment was absolutely pure of all metals other than magnesium. This is as would be expected if it were the pure isotope magnesium 26. Fragment 1 was also the only fragment with the density to be expected of this pure isotope.

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