"The two tribes must swim to a pontoon, dive down ten feet to a rope threaded through a barrel, and pull on it to drag a foot locker fifty feet. When it’s next to the barrel, they will then open it to release eight mess kits, take them back to a solving station on shore, and place them in the right order to spell the Morse code (which was given with treemail for teams to memorize) for immunity." ~ @SurvivorWiki
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They receive a tarp.
Proceed to tribe events.