What the freaking hell could it be, it didn't even sound human, nor something coming from any animal of the area.
Goddamn that was the most unsettling thing I ever heard.
Like it was a long scream, 5 seconds easy, extremely high pitched, it almost sounded like the whistle of a kettle of boiling water but much more louder and well you know, it couldn't be a freaking kettle.
The first thing that came to mind was banshee but I doubt that's it!
And as I wrote banshee the scream resounded again, welp I'm not sleeping tonight, **** that.
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http://en.wikipedia.org/wiki/TORtanic