Though the nature of "Tribulation" is not explicitly stated, it is implied that it was a nuclear holocaust, both by the mutations and by the stories of sailors who report blackened, glassy wastes to the south-west where the remains of faintly glowing cities can be seen (presumably the east coast of the US). Sailors venturing too close to these ruins experience symptoms consistent with radiation sickness. A woman from Sealand, a character with evident knowledge of the Old People's technology, mentions "the power of gods in the hands of children", referring to the nuclear capabilities of world power which were led by incompetent political leaders.
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