
Beneath the Planet of the Apes had one that combines urban and caverns.


The tunnels play a key role in the Tipaan chapters. Most of the Svenjaya have to live in the Svenjaya tunnels.
Tvtropes beneath a steel sky series#
Subterranean civilizations armed with giant Robeasts are a common Super Robot series antagonist. In fantasy, expect instead to find dwarves, goblins and dark elves making their homes down here. (Or that other place.) In Science Fiction and pulp settings, this will often be home to the Mole Men or dinosaurs in a Lost World. In mythology, folklore, and fantasy, this is typically where you'll find The Underworld. Often found side-by-side in with the Underground Level and Absurdly-Spacious Sewer. Particularly well-to-do ones will build an Underground City instead. Not so lucky ones (who often want revenge on whoever forced them to live here) get gloom, fungus (often of incredible size and possibly sentient) and lava (which tends to be somehow survivable). If this subterranean landscape is so vast and habitable that it effectively has a sky, it qualifies as a Hollow World.

The really lucky underground dwellers will have a Lost World thing going, with flora and fauna in abundance (although occasionally with monsters like dinosaurs). Go a few kilometers deeper, and the Earth's crust is filled with spacious caverns. New York has an especially crowded sewer system. (Sewer Dwellers don't pay electricity bills.) Other times, the ruins of an older city may be paved over when a new one is built, leaving the remnants of old streets and buildings to form an under-city home to surviving stragglers, giant vermin, and assorted eccentrics. Maintenance crews never stumble across the living quarters, nor do power companies realize the drain. Sewers are surprisingly clean and warm, relatively speaking, with good lighting and electricity access. The urban area version of this trope is a remarkably livable sewer system. If they had better technology or more resources, they might have built an Elaborate Underground Base or even an Underground City but if they don't they have to make do with simple caves and tunnels. Alternately, they may have fled to escape The End Of Their World As They Knew It. They fled either to create a new home for themselves, or to harbor their grudge for revenge (depending on how well they did). Those who live Beneath the Earth are often exiles from the World Above.

Tom Waits, "Underground" - SwordfishtrombonesĪ very short distance beneath our feet, there dwell fantastic beings, societies and terrors.
