Three young friends, Kevin, Carol, and Eva, who are passionate about caving, decide to explore the ruins of an abandoned mine. They discover, bathed in the light of dawn, a surreal setting to explore. As soon as they enter, they take a dizzying fall through a poorly sealed well. Now trapped at the bottom of an abyss where not a ray of light reaches, they have only one thing to do: wait for help and survive. Victims of their anxiety, they begin to...