The opening scene of 'Saw 4' uses various camera techniques to introduce the setting and characters. It begins with close-ups of a woman's hand and reveals she is wearing a strange mechanical helmet, suggesting she will be tortured. Circular pans around the woman show her confused and scared facial expressions. Shots then cut away to torture tools and chains, with the lights turning on, before panning to an unconscious man in the same room, also wearing a mechanical helmet.