Seeing it in better detail now, I realize my first guess was right on the money—it does look like a fragging prison. Based on shadow-angle calculations, the telecom’s (surprisingly sophisticated) image-analysis software estimates the walls to be eight meters high. Even with maximum image-enhancement, we can’t see whether those walls are topped with anything, but judging from the overall look of the place I’d expect a few strands of razorwire (at best) or monowire (at worst), supplemented by sensors of some kind. What I thought were guard towers are guard towers, or at least something remarkably like them. There’s a single gate to landward, and a couple of boat docks—outside the wall, of course—on the river.