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When you stop moving and simply listen, roll +nerve.
On a 10+, ask 3. On a 7-9, ask 1.
- How far away is the nearest living thing?
- Is the sound I can hear getting closer or has it always been this close?
- What does the echo tell me about the size of what's ahead?
- Is there air moving, and where is it coming from?
- What is the dungeon doing that it wasn't doing before the light went out?
On a miss, you hear something answer the question you didn't ask aloud. The GM describes it in one sentence. It is close enough that you felt the air move when it did.