Nine Miles Down

JC (Dr. Jenny Christensen) wasn't on the roster because Borman falsified her information. She explains that budget constraints prevented gender-segregated quarters, so to accommodate her presence at the all-male drill site, Borman removed her from the official records. This deception explains why Jack couldn't find her in any crew photos or videos.

The scientists were affected by a toxic gas released from an underground cavity nine miles beneath the surface. Inhaling it caused them to experience hallucinations, paranoia, and irrational behavior. Most either died from violence, heart attack, or simply scattered into the desert and were presumed dead. Only JC survived relatively unharmed because she had separate quarters, while the others shared close living spaces and inhaled higher concentrations.

The cryptic Arabic messages scrawled in blood on the facility walls were left by the crew during their descent into madness caused by the toxic gas. These writings reflected their growing paranoia and fear, though the exact translations are not detailed in the story. The messages served as visual evidence of the team's psychological deterioration.

Jack's paranoia stemmed from two combined factors: inhaling the toxic gas from the underground cavity and his pre-existing psychological trauma. The gas blurred the line between reality and imagination, causing vivid hallucinations. Additionally, Jack was already emotionally unstable due to his wife's suicide-murder of their two children six years earlier, which ended his police career. His fractured mental state made him highly susceptible to the gas's effects.

The toxic gas was released from an underground cavity located nine miles beneath the Earth's crust. When inhaled, it caused people to blur the boundaries between reality, memory, and imagination, triggering irrational behavior, violent outbursts, and hallucinations. The gas affected everyone who breathed it, though those in confined spaces like the main living quarters suffered more severe effects. JC was less affected because she had separate quarters.

JC was human, not a demon. The story's Satanic elements, her seductive persona tempting Jack to sell his soul, the hidden recording of Borman claiming 'the Devil has been released', were products of Jack's gas-induced hallucinations and paranoid delusions. The scientific explanation provided at the end confirms that JC was a legitimate scientist whose presence was simply hidden from official records. Her seemingly demonic behavior was either Jack's interpretation or a response to his violent attack on her.

Early in the story, Jack experiences troubling sleep-driven hallucinations that blur reality and nightmare, preparing the audience for his deteriorating perception.

Jack set the facility on fire after wounding JC with a screwdriver during a violent confrontation. Believing JC was a demonic threat to his life and sanity, he panicked and torched the facility as a desperate attempt to destroy what he perceived as evil. His judgment was severely compromised by the toxic gas and his psychological trauma. The fire occurred as a GNE rescue team arrived, allowing both Jack and JC to be evacuated just as the station exploded.

The audio sensors detected what sounded like human screams from deep within the underground cavity. These sounds, detected six days before Jack's arrival, terrified the crew and fueled their paranoia about breaking into some infernal chamber. While the movie leaves the exact source ambiguous, the screams could have been caused by geological phenomena, trapped air vibrations, or simply the crew's fear-manipulated interpretation of ambient sounds, reinforced by the toxic gas affecting their minds.

Jack's wife Susan killed herself and their two children six years before the story takes place. Jack reveals during his birthday dinner with JC that she suspected him of having an affair, which drove her to commit the murder-suicide. This tragedy devastated Jack, causing him to leave the police force and leaving him with profound guilt and psychological scars that the events at the drill site would reopen.

Professor Borman, the head of the research team, was murdered by the chief geologist. His body was stored in the facility's refrigeration unit alongside Dr. Varga, who died of a heart attack. Borman had been the one to authorize the dig into the newly detected air pocket nine miles beneath the surface. A hidden recording later revealed Borman in a feverish state claiming that 'the Devil himself has been released,' reflecting his descent into paranoia.

JC (Dr. Jenny 'JC' Christensen) was a legitimate scientist on the research team, but her presence was hidden from official records due to gender-segregated housing constraints at the remote site. Borman falsified the roster to include her while keeping her existence confidential. She survived the toxic gas exposure relatively unscathed because she had separate quarters away from the main crew, who inhaled higher concentrations in their shared living spaces.

After being evacuated and given a medical explanation for the events, Jack's paranoia resurfaces. He steals a handgun and attempts to kill JC, convinced she remains a threat despite the scientific explanation about the toxic gas. This final act demonstrates that the gas's effects on his mind have not fully subsided, or more likely, that his pre-existing psychological trauma from his family's tragedy has been reawakened. He is stopped by his coworker Alex, leaving him teetering on the edge of despair, contemplating suicide while haunted by memories of his dead wife.