At the start of the level, read the new notebook entry (47/62): "Find the security control room." Start by heading straight across the room to the one open container.
Inside there's a large health pack (1).
Now you'll need to get over the wall that divides this huge room, steal a security pass, and climb to the exit in the far right corner. There are 3 soldiers on guard (1-3) on the other side of the wall. You could shoot them, but if you can get past the first 6 guards without being noticed, you'll unlock the "Silent as a Mouse" achievement/trophy. This guide details two possible routes: Riding over the wall on a shipping container (next) or climbing over (below).
Approach the big metal door with the red lion painted on it.
A short cutscene shows a huge magnet moving to pick up one of the containers. You want to get on top of that container, so don't wait for the magnet to arrive.
As soon as you regain control of Lara, climb onto the single container on the left (when facing the door with the lion).
Turn left and walk to the edge nearest the 3 stacked containers. Wait for the crane to lift the top one off the stack. Then jump forward and grab the top edge of the two remaining containers. Pull up.
Turn left and set Lara up for a running jump. The crane will lower the container a little, then pause before moving on.
Immediately take that running jump and grab the edge of the suspended container. Pull up.
NOTE: If you don't reach the container in time, and it moves on without you, either reload or follow the alternative path shown below.
Once you pull up onto the container, just let the crane carry you over over the wall to the other side of the room. During the ride, Lara mentions not drawing attention to herself. Just stay where you are, near the end of the container.
When the crane sets the container down, drop to the floor behind it, out of sight of the 3 guards.
- OR -
Alternatively, if you miss the free crane ride, you can climb over the wall instead. Start by climbing onto the single container on the left when facing the door with the red lion.
Turn left, walk to the edge, then jump to grab the edge of the two stacked containers. Pull up. Turn right and move toward the end of the stacked containers.
Take a running jump to grab the ventilation unit mounted high on the wall. Pull up and turn right.
Take another running jump to grab the railing of the metal catwalk that runs along the top of the dividing wall. (Or jump onto the brick wall itself. Just take care not to run off the far edge.)
If you land on the brick wall, either jump down onto the perpendicular metal walkway below, or stand on the small mesh box on the left the left and jump over the railing. Then climb down the short ladder onto the perpendicular walkway.
Make sure there are no guards directly below. Then vault over the railing of the lower walkway to land on either of the two huge pipe segments below. (If you drop directly from the walkway to the floor, Lara takes damage.)
Move along on top of the pipes away from the guards. Then drop down in the corner out of sight.
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