Alan and Brian start investigating the effects of the drilling, with help from Allison Saunders, head of research and development at the company.

They realize that they have affected the stability of the Earth's core, which is going to cause natural disasters all over the world.

They figure that the only way to stop the magma flow and earthquakes is to use a series of nuclear explosions to reset the spinning of the Earth's core.

They have an issue with the cabin pressure, but after running diagnostics, they realize that the sensors malfunctioned and they manage to reset them.

There is another large volcanic eruption from Mount Pinatubo in the Philippines, as the destabilization of the Earth's core gets worse.

The drilling team successfully drops the fourth nuclear bomb, but due to their detour around the diamond cave, they run out of communication cable they have been laying to stay in contact with the command center.

Brian and his team find a magma flow, to get them to the surface away from the nuclear bombs before they detonate.