"Two tribes will break up into pairs and race out into the ocean, dive down, untie a series of knots and release a series of floating gates. Behind each gate is a fish trap. Inside each fish trap is a series of puzzle pieces. They will retrieve their fish traps and puzzle pieces and bring it back to the platform. When they have all 4 fish traps, two players will assemble the puzzle. First tribe to finish their puzzle, wins." ~ @SurvivorWiki
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They receive a full-stocked picnic basket for reward.
Proceed to tribe events.