Need Help Replicating a Xenomorph Sound

[MagusDave]

I'm trying to make a breathing loop for the alien and I wanted to have this LFOish sound occasionally pop up in it. In the video linked bellow, you can faintly hear it when the Xeno descends on Brett. Any help would be appreciated. Thanks

https://youtu.be/U2XTmjjhC5U?t=1m12s