There's Someone Underground

Geological prospector Chen Yan discovered a row of ancient carvings pointing to the ground deep in the nameless cave in Guizhou - and a bag of specimens left by his father who had been missing for three years. There was only a note in the bag, seven words: Don't go down. My father's official death record states "cave collapse accident." But a dead man can't leave a note. In order to find out the truth, Chen Yan led a team to forcibly dismantle the stone wall that had been blocked for hundreds of years. Behind the wall is not a dead end, but an entrance. On the other side of the entrance is a completely different world - one with laws, rules, survivors, and predators. There are eleven rules of survival carved out by his father three years ago. There is also the twelfth one, which is half carved, and the knife mark is twisted, as if it was interrupted by something. There are people underground.