"Wherever outside air gets in is where you get out, and outside air comes in gusts: it rises and falls. Whatever hisses steady and constant is the broken pipe, and there's no way out there. And stay away from the transformer."
Drag or use the arrow keys to move. You can't see anything: you only feel the wall when you bump into it, and the map fills in with whatever you touch.
Forty people inside and not a single flashlight. The exit is wherever street air gets in, and all you have to find it is your hearing and your hands. There are other things making noise down here, and one of them you really shouldn't touch.
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