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Unforeseen Circumstances, continued

You're about to have your first encounter with Houndeyes. These little beasts attack with a sonic discharge, and you can hear a high-pitched squeal as they rev up, which gives you a bit of time to kill them before they attack. Near the first pack of Houndeyes, there's a health dispenser through a window on the left as you enter. Jump through the window if you need to fill up. Follow the hallway around, killing any Houndeyes you come across. At the end of the passage, there's a metal door on the right. Go through and climb up the ladder. When you get to the top of the ladder, shoot the canisters to kill the Zombie and Headcrabs. Go down the right passage and talk to the Scientist so that he follows you.

Follow the catwalk to a room with a Zombie finishing off another Scientist. Kill the beast. The Scientist following you will activate the retinal scanner, giving you access to the supply room, filled with Grenades and ammo. After stocking up, leave the supply room and go back down.

Continue following the passageway. You'll encounter your first Alien Slave, a cyclopean beast that shoots bolts of energy from its arms. If you see the energy surrounding its body, it is about to attack. It does quite a bit of electrical damage, so try to kill it before it gets the chance to get you. Follow the hallway all the way to its end, where you'll find a Scientist hiding from some Headcrabs in a dumpster. Behind the dumpster is a health dispenser. Nearby, there's a small hole in the ground next to a metal gate. A Zombie will crawl out of a hole on the other side. Kill the beast by firing through the gate, then drop down into the hole. Follow the tubes until you come across a valve. Turn the valve, and the tubes will begin filling with water. Swim through them until you come to a grate. It will open, and you can climb out on the other side of the gate.

You'll soon come upon a large freight elevator. The switch at the top of the ramp activates it. Flip the switch, then quickly get on the elevator. As you descend, you'll be set upon by a constant stream of Headcrabs from above. Most won't be able to attack. Use the Crowbar on those that don't go sliding off the elevator. Near the end of the elevator ride is a small platform with a health dispenser on it. Be prepared to jump if you need to fill up.

Next, you'll come to a metal catwalk. A Bullsquid will teleport in and break the bridge. Jump to the pipes and follow them around to the ventilation duct. Break the grate with the Crowbar, then climb in. Follow the duct around to the second grate, and then break it and drop down. Beyond the crates, you'll come to another broken catwalk. On the far side, a Bullsquid is killing a bunch of Headcrabs. Let the squid deal with the crabs, then shoot the squid from afar. Now look up. Those are Barnacles. Shoot them from here, or just do your best to avoid their tendrils, which will pull you up into their waiting mouths.

  
   Jump across these boxes to the hallway beyond.

Jump into the water and go all the way to the end. You'll find a ladder leading up to a health dispenser. Follow the walkway around, and go through the door. You'll come to a room filled with suspended boxes. Climb up the ladders, then jump on the railing. Make your way across, jumping carefully from box to box. Once safely on the other side, follow the hallway until you come to a ladder. Climb up. You'll come across a large elevator. Enter and press the button.


Next: Office Complex