Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. This experiment causes a crack to form and grow within the Earth's crust, which threatens to split the earth in two if it is not stopped in time.
A team of maritime salvage workers are about to embark on a recovery dive. However the 1883 Krakatoa Volcano eruption provides more pressing problems.
George Harland and his daughter Pat are photographers who discover a wild boy in the jungle. When Pat becomes lost, Bomba brings her back, overcoming plagues of locusts, forest fires and fierce wild animals.
