The party attempts to leave but finds the elevator mechanism is locked.
They explore around and find signs of a significant struggle, probably a prison break of some kind.
They manage to find a second elevator in the tunning room and are able to operate it with a key discovered in the guards desk. While attempting to escape via the second elevator they are attacked by some unkown force from the darkness, with phantasms jumping in to their bodies and wave after wave of crippling fear washing over them.
They manage to barely escape and then hide in the line of trees near the wall as they recover from the effects of the attacks.