A stunning descent into the tunnels, sewage pipes and subway stations of Madrid.
| Directing | Víctor Moreno | Director |
| Editing | Samuel M. Delgado | Editor |
| Editing | Víctor Moreno | Editor |
| Production | Eva Chillón | Producer |
| Production | José Ángel Alayón Dévora | Producer |
| Camera | José Ángel Alayón Dévora | Director of Photography |
| Production | Nayra Sanz Fuentes | Co-Producer |