Something pretty incredible happened beneath the waves at the Florida Keys. A local radio station broadcast underwater, bringing 400 divers and snorkelers to watch the live music for an event that promoted reef preservation. Video of the event is embedded at the bottom of this post.

The Lower Keys Underwater Music Festival took place at Looe Key Reef, which is part of one the largest oral barrier reefs in the world. The event included four hours from radio station WWUS.

“We have a captive audience down there,” said Bill Becker, the event’s co-founder and the station’s news director, according to an ABC News report. “We have divers and snorkelers listening to public service announcements about reef preservation, coral reef etiquette and diver awareness. It’s things that they can do to lessen their impact on the coral reef.”

The playlist included some fitting tunes, like the theme from “The Little Mermaid” and “Octopus’s Garden” by the Beatles.

“The Annual Underwater Music Festival is scheduled for the Saturday after July 4th, supported by US 1 Radio, Lubell Labs and Looe Key Reef Resort,” the Lower Keys Chamber of Commerce said in a statement. “The festival emphasizes reef preservation, with the radio broadcast offering tips on ways divers and snorkelers can minimize impacts on the Keys’ marine environment. Hundreds of boats converge at Looe Key, part of the continental United States’ only living coral barrier reef, to enjoy this quirky event. Broadcast worldwide, this provides significant promotion for our local tourist industry.”