The director leads Tessa and Stuffie to a large pool with transparent walls. In the water floats a magnificent sound, an extremely rare whale song, in which deep, elongated melodies follow one another, occasionally punctuated by a few short clicks.
Tessa and Stuffie listen with gaping mouths, almost forgetting to breathe. The director explains quietly, mentioning low frequencies and some kind of Hertz, but Tessa and Stuffie barely notice. It's only the whale song that really gets to them.