Dr. Steven Sorenson plans to tap the geothermal energy of the Earth&#39s interior by means of a thermonuclear device detonated deep within the Earth. Despite dire warnings by fellow scientist Ted Rampian, Dr Sorenson proceeds with the experiment after secretly learning that he is terminally ill. This experiment causes a crack to form and grow within the earth&#39s crust, which threatens to split the earth in two if it is not stopped in time.