Flying Saucer or Cobia Cage? AKA Shark and Barracuda thrill scuba divers

The shark in the video is Caribbean reef shark and the barracuda was just curious. We were all swimming around a cobia cage in the Bahamas. This underwater structure was used as a nursery to raise cobia. But the structure looks more like a flying saucer to me. A cobia is a sport fish that looks sorta like a shark.