Definición y Significado de "subterranean fiction"

What is "subterranean fiction"?

Subterranean fiction is a genre that focuses on stories set in or involving underground environments. These tales often explore hidden worlds beneath the Earth's surface, such as underground cities, caverns, or ancient ruins. Subterranean fiction may feature themes of discovery, danger, and the unknown, as characters encounter strange creatures, lost civilizations, or mysterious phenomena in these hidden realms. The genre emphasizes the exploration of what lies below the surface and often combines elements of adventure, fantasy, and science fiction.