Yeah, as much as I love Art Bell, I'm afraid he was an easy target for things like this. It would be incredibly easy to mix a bunch of screams and noises together in a sound file and that's most likely what this is.
If a microphone was at a place where it's 2.000 degrees farenheit, wouldn't it melt?
I still get a kick out of all these urban legend and myths. Even if they're not true, they're good for a little scare of thinking of the small posibility that they might be true.