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:
"Down sank the bell with a gurgling sound;".
It is not ringing loudly, nor enduring. There's not a lot importance on it, except for the idea of a final warning. A sound that is almost not heard, but it is. A last sound. "The bubbles rose and burst around."