- Originally to be directed by Akira Kurosawa, but he pulled out.
- While this film was still in production, Philip Yordan and his company (Security Pictures) had production designer and special effects expert Eugene Lourie design and shoot special effects footage for Krakatoa, East of Java (1969) even though there was no script. This footage would also be shot in large format for Cinerama presentation. Those who were shown the early footage began ignoring this film and asking when "Krakatoa" would be ready.
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