Convinced of the worthiness of a giant, earth-boring machine, David Innes becomes a willing participant in an experiment. On the machines maiden attempt at boring through the earth, David and inventor Perry are trapped in the control room as the machine turns into a runaway. It bores steadily down toward the center of the earth until finally it penetrates into a strange, subterranean world. The two travelers are immediately welcomed by a huge bear-like creature interested solely in having them for breakfast.
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