"First problem, class," Thorn said. "There’s a four-meter high fence surrounding the whole complex, with sensor boxes every ten meters or so around the perimeter. They look like standard Ares Security pressure-and-movement detectors, but you never know what else might be wired in. If you look at the top of the fence, you’ll see cerametal supports, but no visible concertina wire or other barrier. Anyone have an idea what that means?"