Nearly 500 divers and snorkelers submerged in the Florida Keys National Marine Sanctuary on Saturday for a "concert" beneath the sea broadcast by a local radio station.
The 30th annual Lower Keys Underwater Music Festival, held at Looe Key Reef along the continental United States' only living coral barrier reef, featured four hours of commercial-free music piped below the surface via a series of underwater speakers.

The water-themed playlist included such tunes as the Beatles' "Octopus's Garden" and the themes from Disney's "The Little Mermaid" and television's classic "Flipper" about a dolphin at a marine preserve in southern Florida. Participants described the music as clear and ethereal, with underwater visibility of about 50 feet.