A clear as day story of the re-educating of civilisation after the last great cataclysm (likely the Younger Dryas), humanity forced into caves to avoid the fires from the skies, and in it's wake volcanoes, mega-floods, earthquakes, then the bitter cold of ice age snow and winds, likely an atmosphere full of dust and debris, incapable of sustaining vegetative life on any reasonable scale for years on end. Truly apocalyptic times our ancestors lived through.
