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Dr. Stephen Sorensen, an aging scientist dying of cancer, is head of Project Inner Space, a plan to expose the earth's core (magma) as a new source of energy. Against the advice of his wife, Maggie, and his associate, geologist Ted Rampion, Sorensen explodes a powerful atomic bomb. The blast cracks the rock layer surrounding the magma, but the scientists' happiness over the success of the project is short-lived when it is learned that earthquakes have erupted along the volatile Macebo Fault. With the help of Maggie, Rampion concludes that the only way to stop the reaction is by detonating another bomb. The second explosion is set off inside a volcano, but the crack created by the first explosion merely reverses its course, threatening to split the earth. Sorensen tricks Rampion and Maggie into leaving him behind, and they escape just as a large wedge of earth flies into space to form another moon.