"One person from each tribe will swim out to a platform, climb to the top, smash a tile, and retrieve a key. Then the next person goes. Once all five keys are collected, one person will use those keys to open a box and retrieve a ball. The remaining two tribe members will use that ball to break five tiles. First tribe to break all five tiles wins." ~ @SurvivorWiki
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They also win fishing gear!
Proceed to tribe events.