First of all, blinding sunlight fell over his eyes before William got accustomed to the brightness of it. There were many holes in the ceiling, holes that expanded and extended from the surface down to here.
He didn't know how deep this place was, but he was quite sure it was very deep. The last time he was here, there wasn't such a thing present in this place. And that wasn't the only change he spotted here.
The room was narrow before, and couldn't accommodate more than one hundred people. But now? It was massive, enough to accommodate thousands of people.
When he looked closer, he saw lots of rocks filling the ground, as if they fell from the ceiling and walls, as if some sort of a brutal explosion occurred here, changing the entire topography of this place.