"Tribes must traverse certain obstacles, including a dilapidated bridge, and pull a raft across the river while keeping their torch lit. If at any time during the race one of the tribes' flames is extinguished, that tribe automatically loses the challenge. The first team to climb to the top of a 30-foot tower and ignite it with their torch wins immunity." ~ @SurvivorWiki
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They also win 50 water proof matches!
Proceed to tribe events.