Whether it’s the low ceiling or the weight of the bag on his back or the effort of pushing the other two while climbing upwards he’s not sure, but with less than a hundred yards to go, Nolan has to get down on his knees. A little further still and he lowers himself onto his belly and crawls along. The ground feels more uneven when you’re crawling like this. It’s covered in debris. There’s a greater risk of this happening nearer the surface (because there’s more going on up top), and there’s been a few very minor cave-ins. Barry said he thought this had happened here. It’s nothing too serious, though. Nolan knows he wouldn’t be able to see the way out if there was a problem, would he? So close now. That small rectangle of light has continued to increase in size, and if it wasn’t for the t