Unknown World
- Gads: 1951
- Valsts: United States of America
- Žanrs: Adventure, Science Fiction
- Studija: Lippert Pictures
- Atslēgvārds: cave, exploration, scientific expedition, tunnel, underground lake, subterranean world, underground cavern, woman scientist, poison gas
- Direktors: Terry O. Morse
- Lomās: Bruce Kellogg, Otto Waldis, Jim Bannon, Tom Handley, Dick Cogan, George Baxter