Bio-Research Facility - Dark Rooms with Toxic Gas
After using the 3 BOTANICAL ACCESS PASSES to unlock the exit from the GREENHOUSE in the previous section, go down the stairs...
...to a dark, greenish room. The lower level is full of poison gas, so if you want the remaining pickups, you'll need to move quickly. (If you don't care about 100% completion, just proceed to the exit.) To get everything with minimal injury, follow the elevated walkway to the first square opening on the right.
Position Lara above the Vector ammo (23) on the floor below. Drop down, grab the ammo...
...then and run toward the far left corner of the room.
Pick up another Vector clip (24) lying on the floor behind the square support column.
Then run for the small pool.
The gas can no longer affect Lara underwater. So quickly pop an antidote if necessary, to avoid losing any more health. But don't bother healing unless Lara is near death, since you're almost done with the level. Swim through to another small room.
Climb out on the ledge.
Pull the small box under the hole in the walkway above.
Climb onto the box and pull up through the opening onto the walkway. The door is jammed. So search the left and right lockers to find bandages (25) and health pills (26).
Then hop in the water and swim back to the poison gas room.
Climb out of the water on the right and run/sprint to the stairs, where it's safe.
Cross the elevated walkway to the far end, and proceed through two airlocks to end the level.
If you destroyed all 11 mutants near the beginning of the level, the "Unnatural Selection" achievement/trophy should unlock during the cutscene.
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