Ahead of me the tunnel opened up into another chamber, a smaller version of the one where we'd found Theresa, illuminated by the now-familiar red globes. It looked empty. I signaled "all clear" and edged forward. The floor was firmer here, with more the resilience of turf than of flesh. The chamber was, I guessed, about ten meters on a side. I scanned it, the Roomsweeper barrel tracking with my gaze. I'd been right that it was empty. I turned back to wave the others on.