What is "make me nervous" referring to?

Question

*The hallway is eerily empty when I exit the elevator, which always makes me nervous.*Which does make me nervous, The hall way, The hall way being empty or the elevator?

Answer 1

In this instance "the hallway" is what causes the fear of nervousness. The emptiness of the hallway identifies one of the mentioned elements of the fear of the hallway.

Answer 2

This is an excellent question. The writer hasn't been clear here. In general, we could say the clause with which defines the entire sentence (it follows a comma), so the empty hallway with elevator makes me nervous. But in fact, makes me nervous could refer to either the hallway or the elevator, though I suspect the writer meant the hallway. Why do I guess this? Because of the adjective eerily, which is a condition that would make people nervous.