Inventor Harry Harper travels to the South Seas, where there is buried treasure belonging to a girl, Beverly West. Naturally, others are after the loot, and Beverly's father is being held captive by cannibals until she returns to them with a pearl that belongs to one of their idols. The climax consists of Harper saving Beverly from a safe which has been lowered into the sea.
Using a futuristic submarine, pirates kidnap a young couple, torpedo a passenger ship, travel under the sea to salvage bullion, then make their escape by taking to the air.
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