
In the last section we opened two of the doors needed to complete this sequence and made our way to switch (5), behind door (C), near the door leading out into the water.
Switch 5 shuts off the second pair of burners and it is timed. So, from the moment you pull this switch, you'll have just under a minute to run back to switch 3, use it to extinguish the first pair of burners, then run to a safe spot beyond all four burners before they re-ignite. Here's the sequence:

Here's the sequence: Save the game. Flip switch (5) to turn off the second pair of burners.

Press Look to cancel the cutscene.
NOTE: I'm not sure if this is a new bug caused by the Challenge Mode update, but the cutaway after using switch 5 may incorrectly show all 4 burners off. Trust trust me, the first two burners are still lit.

Roll.

Take a running jump into the doorway.

Run off the edge to land in the wet area, turn right, and jump over the light bar.

Continue straight on through the hallway with the portholes (following the path marked with the DARK GREEN broken line on the map). Take running jumps along the straightaway to go faster.

Turn right at the corner...

...and without pausing, take another running jump over the next light bar (following the LIGHT GREEN line the rest of the way).

Run straight on past the corridor with the burners (now on your left), leap over the next light bar, and turn right.

Follow the hallway to the end, taking running jumps to cover the ground faster. As you turn right at the end of the hallway...

...take a running jump into the doorway (B). Inside, run to the right...

...and pull switch (3) again...

...to turn off the first pair of burners. All the burners should be off now, but they won't stay off for long.

So quickly press Look and Roll. (If things have gone well so far, you can save in a new slot. Then you won't have as far to go if you make a mistake and have to reload.)

Take a running jump into the doorway.

Hop down on the other side, turn left, and run like mad to the burners (YELLOW line on the map).

Again, take running jumps along the straight hallway but slow to a run near the end.

Take a running jump over that last light bar just before turning into the burner hallway.

As soon as you've cleared all 4 burners, you can stop and breathe. Lara is safe here.

Pull the last switch (6) to open the exit.
NOTE: If you're struggling with this timed sequence, there are a few alternatives in the main walkthrough.
DARK MODE: I plan to add optional dark mode for these pages, but my current priority is updating the walkthroughs. Meanwhile, may I suggest a reputable dark mode browser extension, such as Dark Reader? (Download only from trusted sites, like darkreader.org or your browser's official add-on/extension site.)
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