The spectacular special visual effects work of Atlantis, the elaborate miniature work of ancient Greek and Roman-style buildings, landscapes, temples, the volcano, the destruction of Atlantis, and the giant crystal ray machine, were the work of the special effects production company Project Unlimited, supervised by Gene Warren, Wah Chang, and Jim Danforth, along with the MGM production staff supervised by A. Arnold Gillespie.
This process was also employed by Jim Danforth to blur the pterodactyl's wings in Hammer Films' "When Dinosaurs Ruled the Earth", and by Randal William Cook on the terror dogs sequence in "Ghostbusters".
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