Strange. My embark seems to have a crapload of magnetite through it. Enough iron that I'm basically not worried at all, especially since I also have marble to make steel with if I choose.
I've just finished the double-slit aquifer. Made all the more interesting by my masons and whatnot running off to help the harvests while I kept un-canceling. Used to doing double-slits much earlier in a fort's life. In a facepalm, I should have burrowed the mason into the double-slit until the walls were completed.
I'm now toying with a number of different trap approaches, and have tested a design in another fort to have bridges (read: Atom smashers) cycle every 210 tics or so with a single roller of power so I can get an atomsmasher into the minecart mauler system if I go that route. ITG brought up an idea though, but I don't know how well (or if) it functions... I'm not sure that undead will path through magma.
However, there are ways to find out... and that's my next test fort. !!Undead pathing Science!!... for once, literally. Not sure I have any other active forts in undead biomes at the moment, I'll need to confirm.
Reading the above from Edge and Merendel, I'm feeling a bit miffed about Stez just pwning the surface for so long on me. Sorry, a titan that early just isn't !FUN!. On the flipside, under other circumstances I would have tossed the fort in annoyance, but I'm invested pretty deeply in this one now, and I've never felt quite so attached to a handful of dwarves.
So! It's not that I've thrown away FurnaceClans, nor that I'm not going to continue the youtube review of the fort. There was a TON of micromanagement crap, doubleslit job cancellation reinstatements, purposely idling the dwarves so my lovers would all get married, and harvesting plants to build up food, booze, and cloth reserves.
Also, a few badly failed attempts to breach the surface. Apparently my dwarves can see for ~20 boxes... and there's an undead within that range... everywhere. We're up to 80 surface undead now. I'll show you those too. Sorry for the delays, but I needed to do some testing on some things... and I needed to play a bit of fort that I could just relax and not get frustrated at the dozen little things for a bit. I'm almost ready to get back into it. I expect I'll post a new video Wednesday or so once I check a few more anti-undead methods.