Wade through the water to the northern corner of the room.
Climb the stairs.
At the top is the room with the treasure chest. Opening it gives you the usual 1200 XP and 250 salvage points, plus the Shipwreck Beach Relic Map, which reveals the relic and document locations on your in-game map.
Use the zip line to slide down to the entrance. Make a pit stop at the camp site if necessary. Then head back outside the way you came. (The main walkthrough includes directions.)
[Part 2 | Return to the Shipwreck Beach Walkthrough]
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