"Five castaways are chosen to swim, one at a time, to a platform, grab a club, and leap off the platform to smash a tile that releases a key. The swimmer then retrieves the key and swims back to shore with it, allowing the next tribe mate to go out. Once the five keys are collected, another castaway uses the keys to open a locked box containing a set of puzzle pieces that form a map of Micronesia. Three other castaways put the puzzle together." ~ @SurvivorWiki
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They receive fishing gear and a bamboo fishing boat for reward.
They can send one player from each tribe to exile island.
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He will return before tribal council.
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Proceed to exile island.