What does Rainsford hear as he swims toward the island and what does the sound foreshadow?

As Rainsford swims toward the island, he hears the distant sound of gunshots. This sound foreshadows the presence of danger and the potential for conflict on the island, hinting at the sinister events that await him. It suggests that he is entering a territory where survival may be at stake, setting a tone of tension and suspense for the story.