There are 2 more braziers (7-8/51) before the first set of ice vents. Be sure to light them for the challenge.
To get past the first row of ice vents, wait for the blue light to move off to the right and quickly run/roll over the darkened vents.
The next brazier (9/51) for the challenge is on the landing between the 2 sets of ice vents. Light it before moving on.
Approach the long row of ice vents. Wait for the blue light to move away from the starting point.
Then carefully follow it, standing only on the dark vents, and picking up gems as you go.
Once you've cleared this trap, jump across the gap in the walkway.
Ahead on the left, is a wider gap with a golden ring mounted on the wall above a row of vertical ice vents. To cross safely, grapple the ring and then wait for the active vents to move away from you...
...before stepping off the ledge into the gap.
Hang from the cable below the vents and wait for the blue lights to move all the way to the left, then shift back to the right...
...before attempting to jump over to the ledge on the left.
In co-op, have one of the archaeologists cross the gap as in the single-player version, above. She can then stand on the pressure pad to raise a wooden ledge below the vertical ice vents. The other player(s) should then wait for the blue lights to move to the left end of the wall before jumping onto the wooden ledge. Then as soon as the lights cycle back to the right side, quickly jump down onto the solid floor.
Or, alternatively, have an archaeologist grapple the ring so the other(s) can tightrope walk up the cable and then jump down on the other side. The archaeologist can then swing across as in the single-player game or use the wooden ledge to jump across.
At the bottom of the steps are two rows of ice vents cycling in opposite directions. Stand facing the middle of the vents and watch the pattern. Just after the blue lights pass each other, moving outward in opposite directions...
...run/jump over them.
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