"How far down do you reckon it'd go?" Spinister wonders, pushing one of Tarn's arms up so that he could get at the tank's armpit. "This place doesn't look like a residence. Might've been some kind of office. Might even connect with one of the metro systems from the basement."

Which means there could be all sorts of neat stuff around! Like repair depots for the train system! Or batteries that might have escaped the EMP damage that everything on the surface had suffered!

... On the other hand, he could also be hyping himself up for nothing.

"We gotta find shovels though. Or make them."