In 2046, deep beneath the Pacific Ocean, a research submersible picks up a mysterious repeating signal. At first thought to be geological, it begins to alter, showing patterns eerily close to language.
Dr. Maren Holt, a disgraced exolinguist, is pulled from obscurity to decode the signal aboard a cutting-edge underwater facility. But the deeper she gets, the clearer it becomes: the signal is not just a message, it's a warning.
As seismic anomalies grow more violent and the crew starts experiencing unexplainable phenomena, Maren must solve the mystery of the signal... before the ocean swallows them all.