The lights ahead of him illuminated a space larger than the tunnel: a room that had been excavated, deep underneath – where? Thinking back on the last few minutes' ride, Jack understood that he had covered a considerable distance – he must have passed all the way beneath the bastion – at least as far as the city's inner wall. And as he drew closer to the lights (several large torchières), he could see that the Turks' tunnel-work, and its supporting timbers, were all involved with things that had been planted in the earth hundreds of years ago: tarred pilings, driven in one alongside the next, and footings of mortared stone and of brick. The Turks had burrowed straight through the foundations of something enormous.