In "Letters to Ali," the soundscape becomes a character of its own, immersing the audience in the tension of an alien-invaded New York City. Robert Mackenzie's re-recording mixing crafts an auditory experience that heightens the suspense and urgency of Sam's journey. The intricate layering of sound elements, from the subtle rustle of footsteps to the distant echoes of chaos, draws viewers into the film's world. Alongside Livia Ruzic's sound design, the film's audio narrative captures the raw emotion and intensity of survival, making the audience feel every heartbeat and breath in this gripping documentary by Clara Law.