If you want good sound quality, get a good set of heaphones and hook them up, (the muff type ones) you will hear all sorts of things while silencing
the sound around you!
i hear "message" but thats matrixing (brain making sens of what it sees / hears)
i would say thats some backbround noise ... wierd air tubulance which makes it into the mic ...
After listening to it a number of times, I must say that it does appear that you have caught "something".
What that something is still needs to be determined.