The fireball in the elevator shaft was shot with real pyrotechnics using a miniature shaft; the camera speed had to vary over the length of the shot because otherwise the fireball would appear to change speed as it moved up the forced-perspective model. The effects people weren't sure exactly at what rate to vary the speed, so they rigged a manual variable-speed control and did several takes changing the speed at different rates and then picked the one that looked best.

Film

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