"The Survivors had to race around a small island by paddling a boat. Along the way they would have to visit several stations, where they would have to complete certain tasks or puzzles in order to receive a tribal flag. However, only one person from each tribe would be allowed to compete at each station. First tribe to have successfully completed each puzzle, gather their flags and race back to the floating dock, would win immunity." ~ @SurvivorWiki
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They also win 50 water proof matches!
Proceed to tribe events.