My forbidden doors are being opened?

[SuperDawsome]

I was preparing a trap room for a forgotten beast, with a sealed door to let them in. I do something else while I wait for ballista constructions to finish. Suddenly I get notified of people dying, and see that the forgotten beast got inside.

How did this happen? I know for a fact I had the door sealed. It also isn't the first time this has happened to me.

[The Trashman]

Some enemies can unlock doors, some can smash them down. Is the door unlocked, or destroyed?

[Holyvision]

There's 'two' padlock buttons on the door, make sure you lock them both and not just one of them. If you only see it "boarded closed" but not with a padlock, if a dwarf has a mental break from being in hiding/etc too long or goes nuts for other means, they can burst through the door for some odd need (like a fey mood and they are running to get something).

I've also had a cat open one before when it wasn't also padlocked.

[SuperDawsome]

Originally posted by Holyvision:

There's 'two' padlock buttons on the door, make sure you lock them both and not just one of them. If you only see it "boarded closed" but not with a padlock, if a dwarf has a mental break from being in hiding/etc too long or goes nuts for other means, they can burst through the door for some odd need (like a fey mood and they are running to get something).

I've also had a cat open one before when it wasn't also padlocked.

I didn't think I'd have to forbid it like that too. Thanks.

[AlP]

Originally posted by SuperDawsome:

How did this happen? I know for a fact I had the door sealed. It also isn't the first time this has happened to me.

All Forgotten Beasts are building destroyers, meaning they will path to and destroy any door near them. You need to use raising bridges to keep them out.