Stuck in Attnam Catacombs

I just started playing IVAN, so bear with me... I don't know if there is a hidden room, an item to continue? I'm stuck, there is no stairwell to continue. This has happened to me twice. Damn Petrus, I'm stuck in the Attnam catacombs.

You're at the bottom of the catacombs with the bookcase?

It's an unfinished area currently, so unfortunately the only way to proceed is to climb back up and leave the way you came.
Messing with the bookcase does trigger events though.