Usopp was surprised for a moment at the humming, but then decided he liked it; it beat listening to the sound of wind blowing through trees in what had to be the absolute creepiest tone possible. Not that he was accusing the wind of being deliberately creepy, but he was suspicious.

Finally, pointing his flashlight further down the broken-down road led them to something new. Boarded over, and covered in warnings to stay out, it looked like an abandoned mine. Usopp stopped stock-still in his path, staring at it. "That's... not a lot better than going down into a death-basement... is it?"