"Prior to the challenge, each tribe must seal the opposing tribe’s flag in a footlocker and use provided rope to try and make the footlocker as impenetrable as possible. At the challenge, they have to retrieve three bundles of floating lumber, then use the lumber and more rope to make it even more impenetrable. After 20 minutes, each tribe switches to the pile containing their flag and footlocker, grab it as quickly as possible, and raise the flag up a flagpole. First tribe to raise their flag wins." ~ @SurvivorWiki
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Proceed to tribe events.