Safety divers, like the one positioned in front of the car, are always watching. So as not to confuse fine acting with genuine distress, the actors had a signal to use if they found themselves in real danger. ''You take your hand and you wave it underneath your throat. Like Cut!,'' Farnsworth says. ''That's the sign for 'I need out of here.''' Because automatic locks really do short out and lock the doors when a car is submerged, Farnsworth had all locks removed on the vehicle for added safety.

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