Laura and Mari are meeting with a medium in the candlelit living room of their new house. The woman asks them about the reason for their call and the girls put her in context. They then begin to explain to her the paranormal events they have experienced since moving into the house: they hear a hissing sound through electrical appliances, a sound they believe to be coming from a hostile and threatening spirit, as they have already suffered attacks from the entity. The woman listens to them attentively before conducting a séance to contact the spirits and find out what is happening in that place.
Unfortunately the movie El Silbido is not yet available on HBO Max.
| Directing | Diego Aguado Rodríguez | Director |
| Camera | Carlos Verdugo | Director of Photography |
| Sound | Esther Pascual | Sound |
| Editing | Diego Aguado Rodríguez | Editor |
| Production | Diego Aguado Rodríguez | Executive Producer |
| Editing | Carlos Verdugo | Colorist |
| Sound | Megan McDuffee | Music |
| Sound | Audionautix | Music |
| Writing | Diego Aguado Rodríguez | Writer |
| Writing | Jose Cabeza | Writers' Assistant |
| Production | Esther Pascual | Casting |
| Art | Esther Pascual | Location Scout |
| Crew | LUCÍA CABALLERO | Script |
| Costume & Make-Up | Marina Martín de Paz | Makeup & Hair |
| Costume & Make-Up | Marina Martín de Paz | Dresser |
| Art | Carlota Martínez | Art Direction |
| Camera | Diego Aguado Rodríguez | Director of Photography |
| Crew | Carlota Martínez | Script |
| Crew | Marina Martín de Paz | Script |
| Camera | Carlos Verdugo | Camera Operator |
| Sound | Esther Pascual | Sound Editor |
| Sound | Esther Pascual | Sound Recordist |
