In the meantime, something had begun stirring inside the yawning vault of Unit Four. At around eight o’clock on Saturday evening, the plant’s deputy chief engineer for science noticed a ruby glow shimmering within the ruins. This was followed by a series of small explosions and brilliant white flashes that leapt from the wreckage of the central hall like geysers of light, illuminating the full height of the 150-meter vent stack.
