Not everything is on the CVR or DFDR. I was showing my father an article in Air & Space Smithsonian about the old kind of FDR's that used a smoke covered glass disk and turned on the TV to see the news of PanAm Lockerbie. My father had been a teacher and the news of falling into a schoolyard especially affected him. https://en.wikipedia.org/wiki/Pan_Am_Flight_103_bombing_investigation Robert Mueller is mentioned as leading the US part of the investigation.