This article reminds me of some videos I've watched on YouTube about paranormal "investigations". It's kind of funny how prone the "investigators" are to interprete random events as paranormal manifestations. Background noises are generally seen as EVPs[1] and they manage to match them to something they were expecting to hear; [2] provides a reasonable explanation for that.

[1] https://en.wikipedia.org/wiki/Electronic_voice_phenomenon [2] https://en.wikipedia.org/wiki/Apophenia