When her archaeologist father disappears on an expedition, Wanda sets out to look for him. What she finds is a secret underground world, where no one...
With the cyclotram, an atomic-powered rock-boring vehicle, Dr. Jerimiah Morley leads an expedition into a subterranean world.
When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry...
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