Keyword Subterranean World

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...