"Sweep 13" begins with an eerie, abstract noise that permeates the atmosphere, instantly setting a dark, sci-fi tone. The noise transitions smoothly into a resonating metallic hit, akin to a massive door opening. The sound seems to morph and evolve, adding an element of suspense and anticipation. Then, a swift, all-encompassing 'woosh' sound takes over, signifying a rapid transition or movement. The audio has an underlying current of darkness and mystery, making it a perfect companion for a suspenseful, otherworldly scenario.