into the Cretaceous Period. Upon arriving, the clock display on the DeLorean's dashboard blinks 12:00, as a reference to a VCR that had lost power. The riders follow Biff's vehicle into a dormant volcano in which a Tyrannosaurus is discovered. Biff goads it into attacking the riders, who barely escape. It strikes Biff's vehicle, sending it flying out of control; the dinosaur then swallows the riders' vehicle, but spits it out mere seconds later. It then drops down onto a lava river to see Biff's DeLorean, now damaged and unable to maneuver, moving down an active lava flow toward the edge of a cliff, with Biff pleading for help from Doc. As both vehicles plunge over the edge, the riders' one accelerates to time travel speed and bumps Biff's, sending both of them back through the vortex to the original point of departure – the present, at the Institute of Future Technology (in which they crash through the Back to the Future logo in front), where Biff get out and thanks the riders and Doc for saving his life, but is soon seized by security. Riders exit the vehicle, as Doc thanks them and reminds them that, "The future is what you make it!" An animated logo of the Institute of Future Technology flashs up on the screen with the words "Please lift lap bar and exit" and after a few seconds Doc warns, "Hurry up! Get out! Before you meet yourself coming in!" As guests leave, the song "Back in Time" plays. Production Ride system The ride was a motion simulator with the DeLoreans located under a 70-foot (21.3–m) OMNIMAX Dome screen. Each of the 24 vehicles (12 per dome) were mounted on three pistons, allowing it to rise, fall, and tilt, following the motion on the screen. The vehicles were arranged on three tiers and were staggered to prevent riders from seeing the other vehicles in the theater. The front section rose eight feet (2.4 m) out of the "garage" when "flying". The actual range of motion from the simulator base was about two feet (0.6 m) in any direction. The motion and the visual input from the screens images, as well as physical effects like wind, water, and smoke, combined to make the guest riders feel as if they were in a high-speed pursuit. The ride was actually composed of two OMNIMAX Dome screens with vehicles arranged