The Peruvian temple interiors used in the film were life-sized sets. The giant boulder—made of fiberglass, plaster and wood—was designed to be wide, but this was reduced to , with the resulting prop weighing . Spielberg liked the effect and had its ramp extended to give it more screen time. The boulder was controlled by a steel rod concealed in the wall by rubber rock outcroppings. Ford performed the stunt ten times for the different camera angles. Spielberg said he was an idiot for letting Ford do it, but it would not have looked as good with a stuntman concealing their face. Ford performed as many of his stunts as was allowed throughout Raiders, suffering various injuries. The tarantulas on Molina's body would not move because they were male and non-aggressive. A female spider was put on his chest to encourage movement. Abandoned ideas for the temple included a crushing wall trap and a pit concealed by spider-webs. The golden idol also had mechanically operated eyes that could follow Jones. For the last part of the scene where Jones flees by plane, the first take ended in near-disaster when the plane crashed from a height of because Ford's dangling leg was blocking the aircraft's right flap.
