Can you post a video or picture so that we know what exactly you’re referring to?
Otherwise, I assume you’re talking about the footage of the explosion itself and of the buildings getting damaged. If so, then the explosion is simply so very bright that it would glare everything out. To compensate for that you need to adjust how much light can reach the film, basically dimming the brightness until the nuclear explosion is no longer too bright to make details out. But then everything else is so dim, and dark it’s basically black.
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