Assistant director Tony Kelly disappeared while shooting second-unit footage along the Zambesi River in Rhodesia. When the crew's boat overturned, the other two crew members were able to swim to safety but Kelly, although the strongest swimmer of them all, disappeared in the water. It is thought he was trying to save the camera equipment and many theories were offered for the disappearance, the most fearful being that he had been taken by crocodiles. No body was ever found.
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