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March 10th 1956: A B-47 carrying 3 US airmen and 2 cores of nuclear material disappears over French Algeria. Despite frantic searches, by French, British, and American forces in the region. No evidence is found of the plane, it's crew, or the 2 cases of nuclear material. It's disappearance remains a mystery to this day.
Now obviously many possibilities remain for this event, some of which involve time travel etc. Putting those aside, let's say that the plane does crash in Algeria however it's significantly off course (instrument failure?). The plane, it's crew, and most notably it's nuclear weapons are recovered by a group of roving Bedouins.