I think the reason others haven't heard, or believe there were voices
in your well is: They never stuck their ear to their well, or they
don't have one.
Radio waves travel both in the air and on the ground. Consider your
well to be a 950' inverted antenna with a water hat on it's inverted
top. This is especially true if snow or rain are present.
Now, check your neighborhood for commercial, ham or CB antennas.
It's as good an idea as anyone elses!