in the long hall before the lava there is a bridge that has to come down.
on the left side is a false wall, with a lever to drop the bridge so you can cross it. two mecha-gnomes will aggro you tho.
On the other wide of the bridge, there is another false room with a switch, for when you need to put the bridge back down again.
You can see the tiny false rooms on the wiki map.
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go go go
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