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[Siber]

My fortress has rather extensive mines, and though there have been a few hiccups,I have done my best to make sure that they're only accessible from the surface through the main body of the fortress itself. There have been temporary breaches, and with the size of the mines it's hard to be sure, but I'm rather confident that they're secure. So it came as a surprise to me when a goblin ambush appeared from within them. Even worse, they seem to be coming from the adamantine mines, which are something of a dead end. They are, however, right up against the edge of the map. So either I've overlooked some entrance somewhere(can goblins fly?) or they can spawn indoors under the right circumstances. Or I'm missing something else entirely.

[Squeegy]

Obviously the goblins are trying to dig into your fortress, and finding an open tunnel, which they enter.

[Siber]

You'll have to excuse me, but me and subtlety aren't getting along well today. Was that comment serious? If it was, I didn't know goblins could do that. If it wasn't, it's not particularly helpful.

[GreyMario]

They can't.

[Keldor]

On a related note, I once had a fire imp appear out of nowhere in a hallway wraping around a lava vent.  There's no way it could have gotten there naturally, since it would have had to somehow get through several levels of the fort's main hallway!  All without disturbing anyone...

[Pickerel]

I had a fire imp do something very similar.

[Kazindir]

Sounds like "monsters" can spawn anywhere that is within their normal spawn zone?

So if a tunnel goes right past a magma vent, you might get the odd fire beasty spawning inside the tunnel even if there is no magma access, just because the tunnel passes through the "fire beasty spawn zone". Same with goblins and tunnels right next to the edge of the map - eg there might just be something like a "ambushes first spawn within 5 tiles of a map edge" rule.

I know goblin ambushes seem to be able to spawn in otherwise inaccessible places - my current map has a tall spire right next to the map edge, the top of which had no outside access, sheer 6+ level cliffs around it. I dug up there to put some windmills up there and the miner got stabbed up badly by the 10ish gobbos camping up there.  :eek: Not sure how long they'd been stuck up there though!

[Keizo]

Out of curiosity, when the goblins spawned in your tunnels, did they also spawn above ground? I.e., did some spawn above ground on the outermost squares, and a few spawn in the mines as well?

Also, I thought goblins spawning on the edge of the map was restricted by the fact that you can't dig all the way to the edge. I always believed the very outer squares of the map were "reserved" for invader/migrant/trader spawns. So, it seems very strange to me that this is occurring.

[GreyMario]

Magma features do not replenish their inhabitants.

Therefore, there is only one explanation...

SCIENCE!

[Deon]

I think they just managed to sneak past your defences.
Do you have 2-3 war dogs tied near the only enctrance to your fortress? If not, in the latest versions ambushers' AI is significally increased to let them avoid your fortress inhabitants.