A couple of bugs

[LightningMonk]

On the Lower Underrail map east of the one where Blaine resides, the destructible rock wall near the exit to the east spawns with a gap in it allowing the player to pass through.

The tab outline function allows the player to see enemies that are outside of the vent view function.

[Taggart]

On the Lower Underrail map east of the one where Blaine resides, the destructible rock wall near the exit to the east spawns with a gap in it allowing the player to pass through.

I'm not sure if that's considered a bug or not - because if you "slip through" - you still end up in a blocked-off area (maybe not the immediate next area) and can't use it to "escape" out to the larger world and places like Core City (IIRC - it's been awhile since I had also found that and explored it...)

[PhrygianDominant]

That one destructible rock is not supposed to be destructible at all, actually; it even respawns if you blow it up Removed.

As for the vents, Styg's taking a look at it.