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After the professor disappeared, several soldiers and I participated in the search and rescue team. After deductions by the instructor and I, we suspected that the professor's body might be hidden in an unexpected place. When we prepared to search it the next day, everyone except us was missing. When we returned to the station, we got lost and walked into the Ecstasy. After wandering around for a few days, we accidentally discovered a cave entrance to the ground on a mountain top. A group of people went down into the cave. Horrifying and weird things happened one after another, including giant catfish, rock mothers, kappas, monitor lizards, unconscious people, and huge reptiles. After experiencing hardships and sacrifices, we found the professor. He told His disappearance was just to search for super-heavy water, and he told us: the entire hole is filled with various energy ores, forming a giant time shuttle, and time is messed up. We meet all kinds of people and animals, as well as weird underground creatures. Many homo sapiens live in deeper places, and they are planning to rebuild their home, a return to nature, a pure and natural world. The premise is to destroy the world above. I, Ma Xu, Lu Ji, the professor, who lives in Xiao Hu's body, started a life-and-death struggle with Homo sapiens, and finally destroyed the cave and returned to the earth. New challenges followed one after another...