"The newly-marooned castaways must jump off their boat, swim across the sea, and reach the drop-off beach where two individual Immunity Necklaces (one for each gender) are waiting. The first man and first woman to wear the necklaces would win immunity." ~ @SurvivorWiki
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Jeff and Caryn find the necklaces.
They now can choose the tribes until two castaways are left.
These two castaways leave the game.
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Jonathan and Janu are not picked.
Proceed to the tribes.