On February 4, 1970, in the Fouquières-lès-Lens coal mine in northern France, sixteen miners were killed in a gas explosion (“firedamp,” grisou in French). This was an accident like many others before it, yet with a relatively high number of fatalities. The public prosecutor concluded, as usual, that there was no case against the publicly owned mine. No investigation was to be carried out. The accident had been the work of fate, of bad luck.