Chapter 701: The Origin of Sky Burial Valley

Actually, this passage was very concealed, and had it not been for the recent battle causing the entire underground city to continuously shake and sink, this passage would probably not have been easily revealed.

"I didn't expect there to be a secret passage here, it seems to lead even deeper!"

At that moment, Xiao Rulong and Chi Jark also noticed, and the three immediately swept over to it.

This even more hidden passage was actually built within the treasure vault, which one could easily deduce was extraordinary.

As soon as Ye Feng arrived at the entrance of the passage, his heart suddenly stirred, and he immediately heard a very strange sound.

"Did you hear anything?" Ye Feng hurriedly asked.

"A sound? No, we didn't!" Xiao Rulong and Chi Jark both shook their heads.