In 2067, the post-war world was devastated, and the ocean became the last resource frontier. Lin Yue, a retired border guard special forces member, encountered a strange sea fog during a maritime transportation mission. When he woke up, he was trapped on a deep-sea island that did not exist on the map. There are no signals, no reinforcements, only mutated creatures, deadly traps, and a group of survivors who are also trapped but more dangerous than the beasts.
Just when everyone was struggling in despair, Lin Yue accidentally awakened the Deep Blue Protocol, which can read hidden information. Blue codes will appear on island facilities, material debris, biological tracks and even death traps, allowing him to predict dangers in advance, unlock supplies, and crack base mechanisms.
But as the exploration deepened, Lin Yue gradually discovered that this island was not a naturally formed desert island at all, but an abandoned alien ecological experimental site. The so-called survival is nothing more than a cruel screening. The so-called escape is just the entrance to a higher cage.
When the competition for resources turns into a fight to raise Gu, and when qualifications for the escape hatch must come at the cost of the death of others, Lin Yue must fight his way between survival instincts, the soldier's bottom line, and human choices. Under the deep sea, the real cage has just closed.
