Collapsed Crypt

We searched Nikokle's crypt with curiosity and respect, we didn't touch anything because we weren't there to steal, we were just looking for information, but when we arrived at the tomb of the great scholar we were very surprised.
The room had largely collapsed, an underground stream flowed beneath us, the collapse had opened a passage towards large underground caves.
And the tomb was not there.
Maybe someone lived in these caves?
We were not hired for this type of mission, but we decided to venture anyway