Prior to filming, the T. rex animatronic had to be enclosed in foam rubber that would resemble the dinosaur’s skin. According to Alan Scott, one of Jurassic Park’s mechanical designers, there was a whole section in the middle that could only be reached by crawling into the animatronic while it was powered up in a particular position. If the power went off for any reason, the head of the T-Rex would move and cause all of the hydraulic cylinders and sheets of metal inside to be in the pathway of the crew member’s body. As luck would have it, the power went off in the entire studio while Scott was inside working. But fortunately he was able to avoid all the moving metal parts and escaped unscathed.