He's learnt a little from his time tracking in the jungle for Charles, from their demon hunt in the City, building on skills he already had to one degree or another. He stays a step behind Charles, close to the wall, and low. It's easy to move quietly, both of them have experience in that.

What is off-putting is the strange bells, and he can't exactly locate where they're coming from. There's not much else: steam escaping somewhere, the faint electric buzz which comes from the walls and lights above them. But on the edge of hearing.

"I'm prepared to wager that these things are going to get hungry at some point. And when they do, the colony isn't all that far away."