On a recent Friday, a squad of thirty-somethings hauled hundreds of pounds of gear over a creek, down a field of boulders and into the dark mouth of a stormwater drainage tunnel.

It was beautiful down in the damp concrete bunker, once the hauling, wiring and setup was complete. By sunset, the crew’s lasers had turned the graffitied walls and ceiling into a glowing funhouse. Thumping bass echoed down the long, dark culvert, which was built to carry floodwater several hundred feet toward the South Platte River.

Zack and Trapa, the dubstep duo known as Barooka, were ready to usher dozens of people inside for a night they wouldn’t forget. This was their first event, and they just knew it would be great. They were joining the city’s literal music underground.

Videos of bumping subterranean c

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