On 4 June 1996, Europe’s brand-new Ariane 5 rocket lifted off from Kourou carrying four scientific satellites and ten years of work. Thirty seconds later it tore itself apart over a mangrove swamp.
It was not sabotage, not a faulty engine, and not — despite the legend — one careless line of code. It was a piece of proven, trusted, decade-old software doing a job that had already finished, on a rocket it had never been tested against.
The Magnanimous Doctor Warthan opens the file on Flight 501: the routine that kept measuring a launch pad the rocket had already left, the number that outgrew the box built to hold it, the backup computer that failed for exactly the same reason a heartbeat earlier — and the assumption that was carefully checked, correctly documented, and quietly stopped being true.
Technical details drawn from the Ariane 501 Inquiry Board report, chaired by Prof. Jacques-Louis Lions (19 July 1996). Nobody was injured: Flight 501 was an uncrewed test flight over an empty range.
The Doctor’s voice and the Society’s imagery are synthesized.