Mad Dash
In a video posted on CBS' website last week, challenge producer John Kirhoffer revealed that the castaways race into the water, where they are forced to overcome a series of obstacles, including climbing up and over a net, going over a barrel roll, climbing up on crates and swimming out to a boat, where they must untie a series of knots and race the boat back. They then must compete a puzzle; first tribe to do so wins immunity — and, of course, a guaranteed three more days in the game.