"The tribes are to push a platform with a fire cauldron through the water, lighting torches along the way with the fire in the cauldron. Upon getting onto shore, they must carry the platform and light a series of torches while on land. After this, one member from each tribe will attempt to make a pole long enough with pieces of stick and twine in order to retrieve a key from behind a gate. The first tribe to go past the gate and light a final torch wins immunity." ~ @SurvivorWiki
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They also win a fire-making kit!
Proceed to tribe events.