Tokyo Three

Some secrets are so secret that the people whose job it is to protect them don't necessarily know them. There are some long kept secrets known by a dying few. One by one they take the secret to the grave, burying it deeper still. Few people know all the details and those that do are never within fall-out distance of the consequences.
There are accidents waiting to happen but some accidents waiting to happen are so inevitable they might as well be deliberate. Their trajectory may be drawn out, but it is to the bull's eye - even if that is no longer a target. When this happens there is blame to be eluded.
Secrets are buried in all sorts of receptacles. This story tells of one of the worst. A secret that was biding its time.
Pity the ordinary man who is the detonator of the accident. It could be anyone, a golfer swinging a club in the wrong place for instance. Pity as much whoever exposes the secret by chance. It could be a teacher on an internet browser or a taxi driver simply doing his job.
Could the sole hope come from an ailing individual? It might be one prepared to sacrifice themself to prevent the world becoming as lost as they are.