Geophysicist Dr. Josh Keyes has made a terrifying discovery: the Earth's inner core has stopped rotating. Now the planet's electromagnetic field is deteriorating and within months, Earth will be destroyed.

One hope exists: to send Keyes and an elite team of scientists in a subterranean vessel to the center of the Earth. As mankind's fate hangs in the balance, the scientists and the ship's crew must do the unthinkable - detonate a nuclear device to reactivate the Earth's core.