Wikipedia
Geofront
A geofront is a science fiction concept, referring to a large, excavated subterranean space typically used for urban expansion.
The concept appears in numerous media:
- anime: Patlabor (ep 19), Neon Genesis Evangelion, Ghost in the Shell, CB Chara Nagai Go World, Pandora in the Crimson Shell: Ghost Urn;
- video game: Ace Combat 3: Electrosphere;
- video game: The Legend of Heroes: Zero no Kiseki & Ao no Kiseki
- in other franchises: Doctor Who, The Matrix;
- literature: Isaac Asimov's novel The Caves of Steel. A parent concept of a subterranean world is also found in Jules Verne's novel A Journey to the Center of the Earth.