Ji Moyan, a young and promising marine bioacoustician, joined the mysterious "Abyss Observation Project" with his pure passion for the mysteries of the deep sea. At the "Eye of the Abyss" base thousands of meters below, he originally thought he was facing only strange creatures and geological wonders, but he did not know that he was stepping into a carefully woven cognitive trap. An unknown life form lurking in the dark deep sea is quietly releasing "cognitive pollution" that can distort memory and tamper with perception. When colleagues around him began to experience subtle memory deviations, and when familiar instructions became vague, Ji Moyan took the lead in detecting the anomaly with his extraordinary logical thinking and keen intuition of sound wave frequencies. He must join forces with Lan Bo, a geological engineer who is also awake, Huo Zhen, an experienced base commander who suffers from memory problems, and Su Rui, a calm medical officer, to build a rational fortress called the "Cognitive Defense Matrix" on the edge of madness. They use the certainty of mathematical formulas, the purifying power of specific sound waves, and even the melody of a familiar old song as anchors to resist the indescribable erosion. As the investigation deepens, a crazy genetic experiment from the Cold War era comes to light, becoming the source of this deep-sea nightmare. Under absolute darkness and pressure, Ji Moyan not only had to fight against the cognitive invasion from the abyss, but also led the team to use human wisdom and tenacity to clear the fog and protect the last light of humanity.
