Cenote – First Water Wheel Puzzle and Flooded Passageway

To exit this area, start by dismantling another wooden barrier beneath the water...

...with your axe.

Then climb back onto the ledge, stand near the winch, and shoot a rope arrow into the axle of the wooden wheel to tether it to the winch.

Crank the winch to rotate the wheel until the opening lines up with the opening below the surface where you just cleared the debris. When the wheel is lined up correctly, Lara says, "There we go," and you get a few XP.

Swim into that opening.

Wait for the opening in the moving wheel ahead to line up with the first opening, then swim through.

Swim forward along the left side of the flooded passageway, cracking open a salvage crate...

...and mining some gold along the way. Then surface for air.

Turn around and swim back down.

But instead of following the passage along the right side, head down and to the left...

...to find a survival cache (7/8) buried in a little dead-end cave. (It should be marked on your map if you found the explorer backpack back at the beginning of the level.)

Return to the surface for air, swim down to loot a resource canister in the right (northwest) corner. Then climb out of the water and follow the passageway to the south.