Hm. Bridges. Apparently they solve everything.
So, you do the double trench idea mentioned before, with one side being your fortress proper, and the other side being the Panic Room. The panic room would be (most likely) just a smaller fortress with basic supplies stashed. Once your dwarves get inside it, you seal the bridges, then build a wall over the entrance. Hopefully your safe room is uncompromised by teh ZOOMBEEHZ.
Or, alternatively, your small individual safe rooms are unconnected to the Panic Room itself, and you either have to dig to it, or deconstruct a wall, also as someone suggested. That way, any one compromised section is automatically prevented from entering the Panic Room. You could combine these both, and have the individual rooms have a double trench/bridge entrance, then a wall/tunnelable section to the main panic room, which would have its own, smaller panic room.
Until, eventually, its thirty five dwarves in a 1x1 space with quantum stockpiled plump helmets and wine. At which point, you might ought just consider retrying the whole 'Fortress' thing...
hmmm... as it stands planned right now, I have 3 sections that can separate in my new fort, plus the small area at the very top of the area for my nobles I am planing. I also embarked on a volcano, so some !!Fun!! might be possilbe as a last ditch effort if needed by simply using lava and gravity.
I realized though that if I have 4 sections that all go to the same bridge where they intersect and meet, I can quaratine 4 areas with a single bridge and much faster. I will do that for the next floor when I need to make it in a couple of more in-game years... I'm on a 2 by 4 embark area so that I got a brook in as well as a volcano.
Also I had a small zombie problem earlier and wasn't quite done yet making our bridge and walls. I ended up just locking everyone inside the fort. The guy killed the one zombie honey bager, died, then was raised. Eventually though one of our horses that got locked out killed both of them and after a while all seemed to be ok.
Now if I can only get more dwarfs to train... I might have to make recruits instead of waiting for migrants since I put my pop cap at 20 and the last wave got me to 25... only 4 soldiers...
Hehe, will take that cap off when I'm ready, but for now I need to get a stronger military. As well, the quarantine design I am making SHOULD take care of any zombies or other problems. Actually, zombies are worse because unless you find the necromancer they just keep multiplying and reviving... insane.
I can't help but think of the first resident evil movie while I'm planning this
darn zombies.
Also necromancers must have really good ambush because I do not ever see them when looking around for them or in the "kill" list of enemies on my military screen.