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[JTTCOTE]

I've been digging down for the magma sea. As I was doing so I opened up a cavern level 1 and got two downward passage marks. I then hit the cavern level 2 and finally cavern level 3. Should I be worried about monsters from cavern level 3 invading my not-so-well-defended level 1 entrance and entering my fort?
So far only a hungry head has come up.

[proxn_punkd]

My caverns at Whisperbolt seem pretty interconnected, too, but I haven't seen a whole lot of inter-cavern migration. On the other hand, I also do not seem to get a lot of flying underground critters at Whisperbolt, so my experiences may not be entirely standard.

[Armeleon]

Wandering monsters tend to stay on their own level. But building destroyers and forgotten beasts will path to the upper cavern if they can get a clear path. Usually this involves flying, so most of the non-flyers you won't have to worry about.  But forgotten beasts will be a problem.

[Loud Whispers]

Not all FB's mind you, but a few will. Also, Cave swallows and bats. :d

[Karakzon]

solution: shove grates over all downward passages. cant be destroyed from below, but it does mean if a dwarf opens it he gets a beard full of forgotten beast ju ju.

[Loud Whispers]

solution: shove grates over all downward passages. cant be destroyed from below, but it does mean if a dwarf opens it he gets a beard full of forgotten beast ju ju.

Or hatches.

[Marshall Burns]

Hatches can for sure be destroyed from below. I don't know if that's true about grates because I've never tried it.

[Loud Whispers]

Hatches can for sure be destroyed from below. I don't know if that's true about grates because I've never tried it.

I've not noticed hatches be destroyed from below... Hmmm....

[Tiruin]

Hatches can for sure be destroyed from below. I don't know if that's true about grates because I've never tried it.

I've not noticed hatches be destroyed from below... Hmmm....

Wait, what?

Hatches cannot be destroyed directly from a building destroyer below it.

[dyllionaire]

I know that's wrong because I've had building destroys break through my fortress that way.
My understanding is that hatches can only be destroyed by a creature STANDING on the tile below, not flying. If you just have a hole in the floor with no stairs leading up to it, a hatch will work fine, but if there are stairs underneath, they'll be able to get through.

[ayoriceball]

I know that's wrong because I've had building destroys break through my fortress that way.
My understanding is that hatches can only be destroyed by a creature STANDING on the tile below, not flying. If you just have a hole in the floor with no stairs leading up to it, a hatch will work fine, but if there are stairs underneath, they'll be able to get through.

I can confirm this through my own experience.

[daneel]

I read that grates were impossible to get through from below on the wiki so that's how I'm getting water out of the cavern in my current fort. But I have a forgotten beast now sitting for a year under the grate not doing anything, as if he's trying to path into the fort.

Thankfully I had a pump taking the water from the grate to elsewhere, so no dwarf needs to go near it.

[Loud Whispers]

I know that's wrong because I've had building destroys break through my fortress that way.
My understanding is that hatches can only be destroyed by a creature STANDING on the tile below, not flying. If you just have a hole in the floor with no stairs leading up to it, a hatch will work fine, but if there are stairs underneath, they'll be able to get through.

I can confirm this through my own experience.

You sure these were rock/metal hatches?

[Ghills]

I've been digging down for the magma sea. As I was doing so I opened up a cavern level 1 and got two downward passage marks. I then hit the cavern level 2 and finally cavern level 3. Should I be worried about monsters from cavern level 3 invading my not-so-well-defended level 1 entrance and entering my fort?
So far only a hungry head has come up.

Yes, you should.  Being attacked from below is a classic way for forts to fall.  I'd wall the caverns off until you feel up to running a military.  Since you've opened all the levels, trees and moss should start sprouting on any mud/soil in your fort, so that's most of the benefits of caverns right there. You can wall off the caverns without losing that.

[Dunamisdeos]

I have had a fort where 3 minor rivers met in one location, and fell via waterfall directly to the third cavern level.
But it lagged so hard I couldn't play it. 

Spoiler (click to show/hide)

There was candy exposed to open air. like 5 veins. It was depressing