About the book: year / They walked, illuminating the path with intersecting rays of lanterns. It’s not strange that it was so dark deep underground. But the darkness seemed excessively, defiantly impenetrable, lightless. It was as if some kind of anti-light, or, more precisely, non-light, had been poured into the darkness to thicken it. Every few seconds, but without any noticeable rhythm, the ground shook.