After hesitating just for a moment, Zhu Yu instantly understood what that huge "stone block" was, and what this "underground chamber" represented.
The "stone block" was a massive stone sarcophagus, and if her guess was right, it should contain a coffin inside.
This "underground chamber" was undoubtedly the main burial chamber of a tomb.
Zhu Yu suddenly felt a bit fortunate that her past hard work sometimes led her to watch things that helped her relax, including those about excavating large tombs.
Otherwise, she might have found herself a bit bemuddled at this moment.
Lu Qing and the rune also clearly realized where they were now, their expressions showing some surprise.
Zhu Yu tiptoed around the stone sarcophagus once, her gaze continuously fixed on the junction of the sarcophagus lid and wall, observing it meticulously.
After circling halfway, she suddenly stopped and silently beckoned Lu Qing and the others.
