For example, the stone chamber Lu Yu visited earlier was the observation hall for the "Wall" construction plan of the Sand King's palace.
Another example would be the Sand Storehouse that Lu Yu had only seen the door of, which is one of the halls of the underground palace used as a warehouse.
Most members of the Sand King's palace were concentrated in the hall, and Lu Yu only took a few glances from afar and did not approach.
Then, as you walk deeper into the underground palace, after passing through several corridors, you can see a hall with many stone columns standing, where the guards are extremely strict, with a sentinel every ten steps.
As a precaution, Lu Yu did not approach that area. He guessed that perhaps the High Priest Shaqian mentioned by Sha Urjati might be in that hall or in the building behind the hall.
The underground palace is enormous, and Lu Yu had not explored a large area. His exploration was primarily to facilitate his escape.
