For this challenge, you must open 5 small treasure chests scattered around the bottom of the pool below the Cenote Vista Base Camp. Their locations are marked with yellow dots on the annotated level map and shown in these screenshots.
The first two chests are near where you initially splash down. One is sitting on this rock shelf close to the surface.
The second is below and a bit to the east of the first. It can be difficult to spot unless you're directly above or west of it, since the rocks partially obscure it. (The first survival cache and relic are nearby, as well as a jade deposit. Watch out for the patrolling piranhas, especially when going after the relic and survival cache.)
Theres a large, squarish rock protruding above the surface in the southeast corner of the pool. It's so big that it's included on the map. The third sunken chest is just below the northern corner of this rock.
The fourth chest is on the southwest side of the pool, just to the left of the opening that leads to the next part of the level.
The last chest is in the northwest corner.
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