A winter diving trip in Norway turns into a desperate race against time for two sisters when one of them becomes trapped at the bottom of the ocean by falling rocks.

Two Swedish/Norwegian stepsisters are doing their yearly winter diving in northern Norway. An accident occurs and a rock traps Tuva against the sea bottom 30 meters down. Ida's abilities to handle a crisis are tested hard. Without help from the outer world, the sisters are forced to rescue themselves.

Swedish-Norwegian half-sisters Ida (Gammel) and Tuva (Martin) 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. During Ida's fight to save Tuva, a fractured sisterhood is exposed, and when all seem lost, the stakes have risen beyond simple survival.