Crouched alone on the floor, in a tiny, windowless cell, Nasim could hear what sounded like other prisoners being tortured. The guard would bang on the door and say: "Can you hear that beating? Get ready, you're next."
She was "interrogated for 10 to 12 hours every day" and repeatedly threatened with execution.
The bare cell, no more than two metres across, had no bed or toilet. Four months in solitary confinement was the 36-year-old hairdresser's introduction to Iran's notorious Evin prison. The only people she saw were her interrogators. She thought that she would "die and no-one would know".
We have pieced together accounts from multiple reliable sources to build a picture of everyday life for Nasim and other women, who are currently being held in Evin prison.
Many were among the tens of thousands of people arrested in connection with the "Woman, Life, Freedom" protests that followed the death of 22-year-old Mahsa Amini in September 2022. Mahsa had been arrested for allegedly breaking Iranian laws that require women to wear the hijab and she died in police custody.
While people have spoken about conditions in Evin after they have been released, it is rare to get details of inmates' lives while they are still inside.