The Whistler Underground

Ronja manages to create a small opening in the rubble and soon hears a whistled tune. Recognizing the song from when Birk whistled it, she begins whistling it back. Birk then calls out unseen to her from the other side and Ronja asks if he meant he would be her brother; Birk responds that it is good to hear his sister's voice and it'd be nice to see her.