Bio-Research Facility - Lab with Mutant Incubation Tanks (No Kills)
If you don't care about achievements/trophies, you can complete this area with all pickups while avoiding the mutants entirely.
As soon as the cutscene ends, turn left...
...and take a running jump into the overgrown corner below the steps.
Roll, pick up the bandages (6), then move out into the open.
Run/sprint to the right, then left...
...along the right side of the incubation tanks toward the far end of the room.
The clawed mutants will probably be headed for the corner where you found the bandages, but if they are lurking nearby, don't kill them, since this is what causes the pill bug mutants to spawn. Run/jump past them and climb the stairs on the right to the elevated walkway. Turn right...
...and sprint to the end...
...where you'll find a Mag Vega clip (7).
Slide down to the floor, turn right, and sprint toward the far end of the room once more.
When you pass the tanks, turn left...
...and run up the other set of stone stairs to the upper ledge. At the top, turn left...
...and sprint forward. About halfway along, pick up another Mag clip (8). Sprint to the far end and get a third Mag Vega clip (9).
Meanwhile, the mutants should be milling around below trying to figure out how to get to Lara. If the coast is clear, just return to the middle of the walkway, where you found the previous ammo clip. Jump straight up to grab the silver drainpipe. Climb the pipe hand over hand to the top...
...and drop onto the walkway above the incubators.
- OR -
If one or both mutants have reached the upper walkway, you can slide down to the floor. Then run around to the stairs and climb back up. With any luck, both mutants will get stuck and you can move freely. Return to the middle of the elevated walkway, where you found the second ammo clip, jump straight up to grab the silver drainpipe (as shown above), and climb to the walkway above the incubators. Continue, following the main walkthrough, to the exit.
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