On a naval expedition to Antarctica, three men and reporter Maggie Hathaway crash-land in a crater 1000 m below sea level. There, they encounter steamy tropical forest, dinosaurs, carnivorous plants, and human footprints, as Maggie's clothes become more and more abbreviated.

A rip-roaring sci-fi adventure that has quite a lot going for it: a novel premise, a square-jawed hero, a lovely blond heroine, and several dinosaurs presented in a bizarre landscape. Universal's ace effects artist Clifford Stine did a terrific job. The sets are also remarkable. The film's explanation for the presences of a tropical prehistoric world in the frozen Antarctic is intelligent and plausible. The character don't act like stereo-types, so the plot avoids being predictable. Be kind when you view the dinosaurs; they serve the story well, despite the fact that they're puppets, men in suits, and enlarged lizards.