The position of the passage entrance is opposite to the direction of the tunnel dug by the Oil Rat. The passage extends thirty to forty meters deep, essentially penetrating into the core of the mountain peak. With such a deep ancient tomb, it's no wonder that for over a thousand years, no one has been able to find the entrance.
It's important to know that Ge Hong was a very famous alchemist, with extensive historical records documenting him. Any tomb thief with some sense would know that after his ascension, his vast wealth would definitely be buried with him in the tomb. Such a tantalizing lure would invariably attract tomb robbers to Luofu Mountain in search of treasure.
However, apart from the Oil Rat, no one has ever visited this ancient tomb, indicating that it is buried deep enough. Otherwise, knowing Luofu Mountain is where Ge Hong ascended, and given how small Luofu Mountain is, there is no reason why they wouldn't be able to find it.
