Character Relationship Map: Breaking Surface

Characters

• Ida (played by Moa Gammel) — protagonist

  One of the two half-sisters and the protagonist. During a winter diving trip in Norway, she must summon immense courage and resourcefulness to rescue her sister Tuva after a rockslide traps her underw...

• Tuva (played by Madeleine Martin) — protagonist

  Ida's half-sister and the other central character. She becomes trapped underwater following a rockslide during a diving trip, setting off the survival ordeal that drives the film's narrative.

• Young Tuva (played by Ingrid Pettersen) — minor
• Tanker Captain's Assistant (played by Remi Alashkar) — supporting
• Tanker Captain (played by Alessio Barreto) — supporting

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Tanker Captain's Assistant → Tanker Captain (assistant)
• Ida → Young Tuva (Family Protective Sister) — The childhood incident establishes Ida's early protective responsibility toward Tuva and the guilt that later affects their relationship.

  The opening memory presents Young Tuva missing near the water while Ida is blamed for not watching over her.

• Ida → Tuva (Family Half-Sisters) — Their relationship is strained by distance, family tensions, and Ida's childhood guilt, but the diving crisis forces Ida to risk her life to save Tuva.

  The plot explicitly identifies Ida and Tuva as sisters and shows them reuniting years after a traumatic childhood incident.

Story Analysis

Two estranged half-sisters confront buried guilt and extreme underwater danger when a dive traps Tuva beneath a rockslide.

Plot Progression

1. The Guilt Beneath the Reunion — A frightening childhood memory establishes Ida's guilt over Young Tuva's disappearance near the water. Years later, the sisters reunite while carrying emotional distance and conflicting plans.
2. Descent into the Passage — Ida and Tuva decide to dive at a remote site connected to their mother. After checking their equipment and planning a route, they enter the underwater passage.
3. Trapped Beneath the Rock — A rockslide traps Tuva and blocks the exit. Ida searches through darkness, reaches the surface, and discovers that communication equipment and access to spare air have been compromised.
4. The Failing Rescue — Ida searches for help, sees an airplane, and returns with another air tank. The sisters cannot shift the rock, and a failed valve makes their remaining resources even more limited.
5. Air Running Out — Tuva urges Ida to escape with the remaining air, but Ida refuses to abandon her. Their dwindling oxygen and decompression danger leave the rescue outcome uncertain.