by Gabriel Velázquez, Manuel Matanza
| international title: | Subterranean |
| original title: | Subterranean |
| country: | Spain |
| year: | 2020 |
| genre: | documentary |
| directed by: | Gabriel Velázquez, Manuel Matanza |
| film run: | 70' |
| screenplay: | Manuel Matanza, Carlos Unamuno |
| cinematography by: | Manuel Matanza |
| film editing: | Manuel Matanza |
| music: | Pablo Crespo, Marieta V. Salvi |
| production: | Escorado Producción |
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