About nineteen hundred years ago, a huge cave was discovered on the isolated island of Beoruska in the South China Sea, with a diameter of about one thousand meters and a depth that is still unknown. Because the cave has a unique force field, it is impossible to observe the depth from the surface, and can only rely on human power to explore downwards. The incredible and ancient relics there are full of magic, attracting many cave explorers... The cave is called the Abyss, and it is the only last secret in this world that has been explored.
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