->Generate a White Noise (5 seconds).
->Change Speed (-75 percent).
->Use the Equalizer to make only the lower tones be heard. I did this two times so the background noise was gone and you only kept the bass of the noise.
->Cross Fade the end of the track.
Note: It is possible that you hear some clicks. Remove them by zooming in and connect the click seamlessly to another wave (in the middle, this might sound unclear, I'm sorry for that).
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