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A few days after Christmas, half-sisters Ida and Tuva set out on a winter dive in a remote part of the Norwegian coastline. Towards the end of the dive, a rockslide traps Tuva under water. As Ida surfaces to call for help, she discovers that the rockslide has struck above water as well, burying their equipment, phones and car keys--they are completely cut off from any chance of outside rescue. As the frantic race for survival unfolds, Ida is put to the ultimate test of character and forcefulness. During Ida's fight to save Tuva, a fractured sisterhood is exposed, and when all seems lost, the stakes rise beyond simple survival.
