NOTE: The map in the main walkthrough uses green arrows to indicate the path from the first switch to the second switch and the secret.

In the last section, we lured the second cyborg into a small room and pulled a switch to trap him there. Now we need to destroy him to get his KEY BIT—and obtain the final secret in the process. From the room with the first switch, below the grate...

...head up the ramp and turn left.

At the FOUR-WAY INTERSECTION, go through the door on the left with the "Danger" sign. (It's the only other doorway not blocked by lasers.)

This passage leads into a room with poison gas jets. Lara will hold her breath as long as she can. (You'll see the blue air meter, just as you do when swimming.) She'll lose some health just from breathing the gas...

...but you can crouch and crawl along the floor as needed to replenish Lara's oxygen.

To reach the second switch and the final secret, go straight through the first poison-gas room and out the other side. (The door opens automatically as you approach.)

Run through the second room, which has a low platform but no switch, and out the door on the left.

Inside the third room, immediately crouch and look to the right for a crawlspace containing the final golden rose (21) (SECRET #3, 36/36).

If you found all secrets in the New York levels, you'll unlock the "Codex of VCI" achievement/trophy here.

Crawl back out, jump onto the low platform, and pull the second switch to unlock a door elsewhere.
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