That ^^ made me think of this, for some reason: https://en.wikipedia.org/wiki/Vela_incident
I find the idea of simply not knowing¹ forty years later really quite disturbing.
¹ Trusting that explanation is accurate
Please forgive my yelling-caps here but it's from the original document and I don't feel like re-writing it all lol
"THE AEC NEEDS TO ESTABLISH HOW SOUTH AFRICA GOT ITS PRESENT NUCLEAR WEAPONS CAPABILITY."
"HE NOTED HIS BELIEF THAT THE SUPPOSED "NUCLEAR EVENT" OF LAST SEPTEMBER WAS IN FACT A NUCLEAR WEAPONS TEST BY SOUTH AFRICA. HE URGED THE SECURITY COUNCIL TO CALL FOR A COMPLETE HALT TO ALL NUCLEAR COLLABORATION WITH SOUTH AFRICA, INCLUDING THE EXPORT OF URANIUM FROM SOUTH AFRICA/NAMIBIA. HE STATED THAT THE EX-CHIEF OF SCIENTIFIC RESEARCH FOR THE ISRAELI ARMY HAD VISITED SOUTH AFRICA III NOVEMBER, 1979 AND DEMANDED TO KNOW WHAT THE PURPOSE OF HIS VISIT HAD BEEN. HE CALLED THE FRG'S DISAVOWAL OF NUCLEAR COLLABORATION WITH SOUTH AFRICA "MORE FICTION THAT FACT""