These inquiries could have easily taken quite some time, depending on how long it took to track down somebody with the information they were looking for. The worst-case scenario would have been Vireylda needing to come back another day. Thankfully, though, it wouldn't be anything quite so egregious. There were some consultants on-site who were helping with the dismantling, after all - this was a sanctioned demolition. So before long Thorek would get back to Vireylda on the matter.
"It's basically just one long corridor with some rooms in it, before it opens out into the sewers that run under the Academy," the dwarf would explain to Vireylda. "Most of it's all probably wreckage at this point, but from the sound of it, there's probably not too much down there worth worrying about. Bit of storage for cleaning supplies, office supplies... maintenance folks mostly worked down there."
The real danger, though? "We put out the fires up here, but there's no telling what might still be smoldering down there, didn't get that far down. So do be careful, yeah?"