The Swedish/Norwegian half sisters 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. On their own without help from the outer world are the sisters forced to rescue themselves.
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.