Episode 5A - "A Stone Puzzle": Terry and Victor examine the artifact and think it's about an ancient king from Coba. They travel to Coba to visit with archaeologists George and Jean Andrews, to see if they can find out more about the artifact. Meanwhile, Pepper and Tomas stay behind aboard the Mimi. Expedition 5B - "Feeling the Pressure": Hosted by Ben Affleck. Ben returns to the North American Hyperbaric Center in New York City. This time he gets to go inside the hyperbaric chamber for his own "test dive" pressure test and to conduct a few experiments of his own, to see how different items respond to the pressure.