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. <br />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. <br /> <br />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.
