Here's the sound we played as a clue. We asked you to guess what exactly it is and where exactly in the Bay Area we recorded it.
Listen above for the full answer.
BRANDON ALVIS: Watch out for the spiderwebs and whatnot. One thing I will tell you, it's a really narrow staircase, very steep, so do not put your hands against the left hand side of the wall ... This area has had some activity and people have reported feeling sensations down here, as well as hearing the voices of a child.
We'll have a new sound for you to guess and another chance to win next week.
In the meantime, is there a sound from your life that should be featured on Audiograph? Call at 415-264-7106 and tell us about the sound of where you live.