So many get bent out of shape over this, so let's examine it and see if we can put it to rest. Everyone knows that engineering is "downstairs," somewhere in the secondary hull, right? We hear that in dialogue. And yet we often see that the hallway leading to it is curved. So it must be in the round primary hull. Or maybe it's a second engineering section in the primary hull. Maybe it's a duplicate engineering room. Maybe it's for impulse. Maybe -- and so on. You see this in many other threads. I think this is all limited thinking. I prefer to think that starship designers merely like curved hallways, all over the Connies. The primary hull's hallways could as easily have been laid out as a grid. Instead, they're curved. So, too, are many of our contemporary suburban streets; instead of running straight, they often curve and meander. Think about it. Let's say you live in a spacegoing community of 400. A curved hallway gives you a tiny sense of community, of neighborhood. Otherwise, you've got an endless hall, and anyone down at the other end can see you in your space jammies when you run across to see your neighbor or use the lavatory. So I say that that the secondary hull must be filled with curved hallways. No problem!