A Dream?

Quickly retracting his Spiritual Sense and breathing through his nose, Di Tou managed to recover. Taking another moment to adjust his eyesight once again, Di Tou slowly examined the room to find that although it was still ominous, it wasn't quite as bad as what he had seen above. Down here, the metal bars revealed themselves to be empty cages. Of course, this wasn't exactly pleasant, but the scariest part about the cages was that they were all empty. There was no blood, no grime, no rust.

They were just empty cages. 

As for the circular hunks of metal…

After looking for a moment, Di Tou realized it wasn't a hunk of metal but rather the entire wall system of this underground room. Running in a circular shape, the wall was made out of a rippled circular metal that came in and out as it surrounded him, causing him to feel like he was also trapped in a cage.