This is the last unaccounted for challenge on the white board. On S10 it was a post merge IC (with the first 'Exile Island'). Although it could easily be an individual RC I'm not sure how they could make it a pre merge tribal challenge.

It could also be the challenge that was dropped when the pre merge double boot became unnecessary, but I already did the research soooo . . .


http://www.cbs.com/primetime/survivor10/show/ep10/index5.shtml


S10 Palau - Ep10:IC 'LAST GASP'


As Koror assembled for the Immunity Challenge, Jeff Probst explained that the Survivors would be tested in the water during a rising tide. A steel cage would be set up in the water at low tide, with the castaways huddled inside under a steel tier. With the rising tide, the Survivors must fight for air, and the last player to stay under the cage would win Immunity. Raising the stakes, Jeff Probst added that the first one out would have to endure a night alone on an unknown beach.

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