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Lambda Core

Enter the control room and push the button. Get on the freight elevator next to the truck and ride it down. In the room below, several Headcrabs and a Bullsquid await. Search the crates and climb up the ladder to the health dispenser. Go through the small metal door to the ladder.

You'll enter hazardous materials bay A. There are several Human Assassins on the ground floor and two on the walkway above. There's a passage to the right blocked by crates. Break through and climb the stairs to the catwalk. Walk over to the passage on the left. Go down the stairs to access health and HEV power dispensers. Go up the stairs and follow the hallway to the elevator. Ride the elevator down.

Open the door to hazardous materials bay B. Two Alien Grunts will be waiting. Move back to the hallway and take them out. Another will teleport in. Use the explosive canisters just next to it for an easier kill. One more will teleport into the storage bay. Once it's gone, climb up the ladder to the door and talk to the Scientist. He'll tell you about the Lambda reactor, then open the security door. Enter the reactor.

Use the dispensers on the left, then ride the lift up to the second level. Turn right and enter the test firing lab. Pick up the EGON and the ammo from the shelf. You can open the firing chambers and kill the Headcrabs and Bullsquid beyond, but it isn't necessary. Exit the lab and go down the hall to the coolant system elevator.

  
   You must turn on both pumps to flood the reactor core.
Turn right and follow the signs to the maintenance station. Talk to the guard and the Scientist. Get the ammo and use the dispensers. Now leave the station and return up the stairs. Follow the blue paint on the walls to coolant system 01. Fight your way to pump station 01, and flip the switch on the pump. Go back to the main area and follow the orange paint to coolant system 02. You'll need to jump over some debris and fight a number of guards on your way to the next pump station. The catwalk just before the pump station will collapse as an Alien Grunt teleports in. Jump the gap, avoid the Barnacles, and keep moving. Just before the pump station, turn the valve to shut off the steam pipe.

Fight the Headcrabs in the pump room, then flip the switch. Get the HEV power canisters and make your way back to the main area.


Next: Lambda Core, continued