The San Jose Mercury News reports that mysterious noises and weird goings-on have piqued the curiosity of neighbors around Apple’s secretive workshop in Sunnyvale, Calif., to the point that one woman climbs up on her roof in hopes of spying on whatever’s going on behind the 12-foot sheet metal fence the company erected around its property.

Here’s what has grabbed the neighborhood’s attention: In addition to traffic noises from trucks coming in and out at all hours, there are also strange thumps and banging in the dead of night, a mysterious “whine or hum that rises in pitch” and a sound like someone “waving around a large piece of sheet metal,” writes SJMN reporter Ethan Baron.

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This article originally appeared on Recode.net.