A treasure chest is submerged 150 yards off the Sand Spit. Each tribe must swim out to the treasure chest. Once the entire tribe arrives, they must dive down and work as a group to drag the chest along the ocean bottom back to shore. First tribe to haul their chest ashore and open it wins.
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They can bring their treasure chest to camp. The chest contains fishing supplies (mask, snorkel, spear, flippers, and bait).
Proceed to the immunity challenge.