A sound i made in audacity, basicly a chirp going down from about 500 hz to 20 hz (with a fade-out to limit subwoofer use)and added some ambience by using white noise rumble on the background, also added a slight wah-wah as you might notice. Feel free to use it in a project as long as you give 'olaf gillot' credit. And of course 'freesound. Org' for having such an awesome website, with free hosting stuff :d!.
Author: Olaf