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Watching the Yunnan Worm Valley movie, I have a question for you to explain

Yesterday I watched the yunnan worm valley movie, at the beginning, Hu Bayi asked Chen Blind Zi, Chen Blind Zi is the only person who has been to the Tomb of the King of Sacrifice, must have seen the eyes of the Snake King before he was blind, but the problem is, Hu Bayi they arrived at the Tomb of the King of Sacrifice, they also encountered the King of The Snake King, but at this time the Tomb of the King of Sacrifice was the same as nothing happened, it is reasonable to say that such a big snake king appeared, it must be earth-shattering, a mess, when Chen Blind Zi first went, it was a few decades away from Hu Bayi, was someone rebuilding the Tomb of the King of Sacrifice?