Answer: The bell sinks into the water with a gurgling sound, as if trying to sound one last warning; this creates an ominous mood.
Step-by-step explanation:
This stanza is from "The Inchcape Rock", a ballad written by Robert Southey. In this ballad, the Abbot of Aberbrothok places a bell on a buoy, which rings only when the Inchcape Rock is under water.
When the bell sinks into the water, it leaves the gurgling sound behind. The sound of ringing is neither too loud nor too enduring. The line - "The bubbles rose and burst around" creates a dark mood.