Explore part of the continental United States’ only living coral barrier reef Saturday, July 7, off the Florida Keys -- while rocking to a unique sub-sea concert dedicated to reef protection. It’s the annual Lower Keys Underwater Music Festival, and it’s unlike any other dive or snorkel experience on the planet. The “Only in the Keys” adventure takes place each year at Looe Key Reef, an area of the Florida Keys National Marine Sanctuary about 6 miles south of Big Pine Key. Broadcast underwater by a Keys radio station, the music enhances the underwater experience for divers discovering the Keys’ fantastic realm of tropical fish, coral formations and other marine life. Some participants wear costumes, portraying everything from mermaids to rock stars, and a few even pretend to play underwater instruments sculpted by a Florida Keys artist. It’s all designed to encourage preservation of the Keys’ rich coral reef ecosystem.