At the beginning of the 21st century, the depletion of oil and natural gas resources triggers a global crisis, sparking a race to discover the last remaining deposits. People begin to explore the last unknown areas of the planet, the ocean depths. While drilling in an underwater cave, divers are attacked by a living fossil, a Megalodon, the prehistoric ancestor of the great white shark - the largest marine predator to have ever lived on Earth. And this is not the last extinct species that oceanographer Kim Melville discovers. It is a scientific sensation and a discovery that could challenge the ecological balance of the planet and the survival of humanity.