Part 7

Crawl along pipes to a platform with a vent grating. Bash the grating with your crowbar and crouch-walk through the vent shaft.

Bash the second floor grating and drop through. Turn right and bash crates to find armor batteries.

Observe the bullsquid on the lower floor. Wait for it to finish killing headcrabs, then use your pistol to kill it, strafing to avoid its spit. Shoot any remaining headcrabs.

To cross to the bullsquid's location, use the broken metal walkway. Take a running jump from the left end. Alternatively, return the way you came to find a door, a ladder down, and another door. A safer method involves waiting behind a barrel for the bullsquid to kill more headcrabs, then shooting it while using cover (press the cover button to crouch behind walls or objects) from its spit. You can push a wooden crate into the canal to jump across, but be quick as it will float away. Crates will sink under your weight. You can also enter the canal, hop onto small lights along the other side, then jump-crouch to the floor. Another option is to swim to the canal's end, use a ladder to a small room with a first aid station, then go through a door and along a narrow ledge.

Go through the door near the bullsquid and down a corridor to reach section c1a1d.

In section c1a1d, reach a large room with hanging crates and two ladders. Climb the second ladder, quicksave, then jump onto the railing near the rightmost hanging crate. Move onto the crate, then do a running jump to the next crate directly ahead. Drop to the next crate without jumping, turn right, and drop to the next two crates. Finally, drop to the floor.

Move down the corridor until you find a ladder in a red-lit room. Climb it and proceed down a corridor that leads back to section c1a1c.

In section c1a1c again, move down the corridor and exit through a door. Go right to find a large elevator. Use the button panel to open it, enter, and use the interior button panel to ride to the "Office Complex" chapter.

Leave the elevator in section c1a2 to find a health pack and armor battery. Turn left and observe the electrical hazard killing headcrabs.

To bypass the electrical hazard safely, find the vent grating near it. Crouch-walk to it, bash it with your crowbar, and enter the vent shaft, turning left.

When you reach a barred window looking into a fan room, turn right. Use your flashlight to find another grating. Bash it and move within the shaft until headcrabs in the fan room are killed by the fan.

Do not enter the fan room yet. Return to the other end of the vent shaft. Bash through another grating to drop to the floor. Open the two nearby locked doors from the inside. Bash the two vending machines.

Approach the scientist near the table lamp. Talk to him to make him follow you. Maneuver him into being caught by one of the three barnacles. You can then kill the barnacles by letting them catch you and bashing them when they pull you in.

Find the door with the high voltage sign to its right. Go through it and use the lever on the panel to the left to turn off the power to the hallway hazard.

Return to the vent opening in the hallway and reenter it, going left to the fan room entrance. Drop into the fan room and check near the dead security guard for two bullet clips.

Crouch-jump back into the shaft, return to the hallway, and go past the deactivated electrical hazard. Bash the glass out of the unopenable window and crouch-jump through it.

Pass by the D-AL 101 room. Move against the unopenable wooden door in the "STORAGE" area. Wait for a zombie to break through the door, then shoot it.

In the dark storage room, crouch and move on the lowest part of the wrecked shelves to pick up two bullet clips.