CHABOGA MOGO IS BORN

As soon as the tribes merged, they agreed upon a new name. They combined the names of the three tribes that started SURVIVOR: ALL STARS, Saboga, Chapera and Mogo Mogo, to create "Chaboga Mogo." As the castaways got set to build their new shelter, Lex approached Rob about an earlier promise to take care of him for saving Amber at the previous Tribal Council. Rob's assurances didn't sit well with Lex, who was starting to feel double-crossed. "I won't stick a knife in your back," Rob promised.

Shortly after making that promise, Rob took Amber aside and explained that Lex was next to go. Amber voiced her concern that she and Rob would soon be targets themselves.

IMMUNITY CHALLENGE: WAITING TO EXHALE

As the tribe reconvened for the Immunity Challenge, Jeff Probst explained this would be an individual Challenge granting Immunity to two castaways instead of one. This Challenge would test the All-Stars' underwater skills. The first round would simply be a competition to determine who could hold their breath the longest. The two victorious women would advance to the second round, as would the two winning men. The second round required the finalists, competing within same-sex pairs, to swim underwater along a course of buoys that they must release. The first woman and man to release ten buoys would be granted Immunity.

As this crucial Challenge began, the nine castaways submerged themselves. Alicia and Jenna were first to swim up. Shii Ann rose to the top, thus advancing Kathy and Amber to the women's final round. After Rupert and Big Tom couldn't hold on, Lex and Rob were left to battle it out in the men's final stage.

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