Taking their show to new lows, quirky magicians Penn & Teller head deep beneath the Caribbean Sea to the ocean floor. But being submerged doesn't faze the unflappable duo as they pull off some incredible hocus-pocus amid the fish and seaweed. Their bag of tricks includes Teller -- surrounded by a school of ravenous sharks -- escaping from a straitjacket, Penn sawing a mermaid in half and the pair making a 75-foot submarine vanish!