Waterhouse is still trying to get some idea of where he is by shining his flashlight beam around the place, which is kind of like peering through a soda straw. He can’t get any synoptic view of his surroundings, just narrow glimpses of pipes and wires. Finally he tries holding his head still and sort of scribbling the flashlight beam around really fast. A picture emerges: they are in a narrow crawl space, obviously designed by and for engineers, intended to give access to a few thousand linear miles of pipes and wires that have been forced through some kind of bottleneck.