Off the coast of McMurdo Station, in the frigid waters of the Southern Ocean, a new species of Antarctic octopus is unintentionally discovered. Specialists aboard a state-of-the-art DARPA research vessel aim to apply the animal's "sub-zero venom" to one of their projects: an experimental painkiller designed for soldiers on the front lines.

A woman searching for a sister lost at sea. A man bent on finding lost treasure. A mother who has lost all hope. A maniac who believes all life exists for his pleasure. The man who would keep them all safe. Together, they will all seek below the waves for treasures long buried, and riches beyond belief. But those treasures hide something. Something ancient, something dark. A creature that exists only to feed on those that would enter into its realm. A creature... of The Deep.

An accomplished geneticist, known for trailblazing work with a gene editing technology known as CRISPR, is found dead at his desk in his South Florida home by apparent suicide. His jugular vein punctured with a foot-long T-rex claw. However, the claw is not a fossilized one. A simple note signed by the scientist reads, “I’m sorry”. A team of researchers and park rangers is hastily and quietly assembled to find out what it is he’s apologized for, suspecting he has unleashed a genetically altered animal atrocity into the wild.

Down there, beyond the deepest caves, below the crust and the mantle, there is another world. An old woman locked away in a Russian asylum has a secret - knowledge of a 500-year-old manuscript written by a long-dead alchemist that will show a passage to the mythical centre of the Earth. She knows it’s real because 50 years ago, she and a team travelled there. And only she made it back. Today, caving specialist Mike Monroe leads a crew into the world’s deepest cave in the former Soviet Union. 

During a violent storm, Flight 207 crash-lands in the South China Sea. Poseidon Tech tracks the wreckage to an uncharted island and dispatches a curious salvage team - two paleontologists, a biologist specializing in animal behavior, a botanist, and a nefarious big game hunter. Escorted by a heavily armed security team, they cut through the jungle and quickly find themselves in a terrifying fight for survival, running a deadly gauntlet of prehistoric predators.