In the wake of the Great Ice Melt, the remnants of humanity survive in sprawling floating cities like New Atlantis, relying on deep-sea geothermal vents for energy. But when underwater research bases begin to disappear—attacked by a massive and intelligent creature—marine biologist Dr. Elara Voss and paleontologist Dr. Ria Chaudhry uncover a horrifying truth:

The melting ice has submerged the world and opened prisons for creatures older than the dinosaurs.

As the attacks escalate, humanity realizes that these sea creatures are not just animals. They are hyper-advanced hunters, armed with collective intelligence, biocommunication, and a terrifying ability to infiltrate and repurpose human technology—and even the human body.

Led by the hard-nosed Admiral Hale and the desperate survivors of New Atlantis, humanity fights back with fire, sonic, and brute force—only to discover that their war has awakened something far worse: the true rulers of the deep, colossal, city-dwarfing creatures whose awakening signals the beginning of the ocean's final reckoning.