After unlocking the sprinting jump ability, as shown in the previous section, follow the other branch of the main tunnel to a second cavern with tall stone pillars and lava below. There's a lever near the entrance that opens the iron gate on the far side. It stays open for less than 20 seconds, so you'll need to move quickly and use the ability you just unlocked. Quick-save. Then pull the lever.
During the brief cutscene showing the gate opening, you can see Lara in the distance and move her a little before the camera shifts back to her point of view. I found it difficult to do anything more than pivot so she's facing in the right direction.
As soon as you can see where you're going, take a regular running jump onto the first group of pillars.
Then use the new sprinting jump: hold Forward and Dash to race across the platform. Just before Lara reaches the far edge...
...press Jump to clear the gap...
...and land on the next set of pillars.
Continue sprinting forward. Then jump to clear the next gap.
When you use the sprinting jump, you'll see Lara pump her legs like a long jumper, as though she's running on air, and she'll clear each gap without having to grab on the other side.
You should then have plenty of time to run through the gate before it closes.
Notes on the controls, along with alternatives for this sequence, are included in the main walkthrough. The room on the other side of the gate is covered in the next section.
If you don't make it in time, either reload your quick-save or make your way back to the entrance: Turn around to face away from the gate. Then either take a sprinting jump back across the gap, grab the edge of the nearest pillar, and pull up. Or, move to the left wall, jump up to grab the horizontal ledge, traverse to the right as far as Lara will go, then drop down.
Jump over the smaller pillars into the tunnel on the right cavern wall. Follow this tunnel back toward the entrance.
When you reach the tunnel opening, take a short hop (Walk + Jump) onto the nearby set of pillars (or a regular standing jump angled slightly to the right).
Then either jump over to the pillars below the lever or grab the narrow ledge on the left wall, traverse to the right, drop down, and take a short hop over to the ledges below the lever. Climb back up and and try again.
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