In the excerpt from "Over Sea, Under Stone" by Susan Cooper, the protagonist finds solace in the gentle sound of the sea that reaches him faintly. This familiar murmur brings a sense of comfort and joy, suggesting a strong connection to nature and his surroundings. The noise serves as a reminder of the world outside and uplifts his spirit.

As the protagonist reflects on the cheerful noise, it triggers memories of what they were meant to accomplish. This moment highlights the interplay between the natural world and personal introspection, reinforcing themes of nostalgia and purpose within the story.