Alien/Prometheus Sound Effect Request

So there was a great post here that showed it was possible to [url=http://www.prometheus-movie.com/community/forums/topic/3036]isolate the "Alien Scream" sound[/url] and actually make it with darn good quality. Searching for "Sound Effects" w/ "Alien" on Google is an effort in futility and frustration. I am wondering if there would be any chance of someone having a link or even being able to isolate the "Feedback Hum" with the same quality as Mark did w/ the Alien Scream? I am not a sound engineer nor do I have any type of equipment/application/experience to do such a thing. The effect is the sound that is emitted in the [url=http://www.youtube.com/watch?v=pyz9ktII0dM]US Trailer at about 1:11[/url] (When Shaw says "Prometheus, are you seeing this?"). This "Feedback Hum" is also used in the original Alien, I believe as a proximity effect when Kane moves his hand through the mist over the eggs (I could be wrong as to this being the place for it). This is one of those sounds that can be immediately identified if you know of the movies... and I've been looking for it for quite awhile w/out any luck. Anyway, thanks! PAR