After fighting the mutants, as described in the previous section, you'll need to find a way out.
The big door at the far end of the room doesn't open. But this is Tomb Raider; we're used to round-about routes.
First go after a few pickups: There's a Mag Vega clip (6) at the end of the ledge below the pill bug chutes on the left (when facing the entrance), bandages (7) in the bushes between the stairs and the slope to the right of the entrance, and 2 more Mag Vega clips (8-9) on the long ledge below the pill bug chutes on the right.
When you have everything, move to the middle of the ledge where you found the two ammo clips. Jump straight up to grab the silver drainpipe, climb the pipe hand over hand to the top...
...and drop onto the narrow walkway. Carefully follow it to the right. Turn the first valve.
Now head for the far end of the walkway.
When you reach the broken section, use short hops (Walk + Jump) to clear the gaps. Continue to the second valve and turn it.
This opens a trapdoor at the bottom of the tank from which the first mutant emerged.
Climb down the ladder near the second valve as far as you can. If you drop to the floor from there, Lara will lose some health. If you're playing with classic controls, you can avoid this by quickly releasing and re-pressing action, to grab, grab, grab the ladder as you drop, breaking Lara's fall.
- OR -
Instead backtrack to the silver drainpipe, climb back down the way you came, and slide to the floor.
Drop through the opening in the bottom of the shattered incubator, directly ahead on the right if you've just climbed down the ladder.
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