Dismantling the dirigible-ship Monarch & the submarine Porpoise, our crew constructs from the combined parts the Flying Mermaid which is both airship & submarine. They leave their home in Maine & head for a region of the South Polar sea where they previously found an opening into the Hollow Earth & fly right in. Deep below the earth they discover a lost race of giants & experience a tremendous lot of adventures involving a murderous plant, weird animals, & a subterranean…
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