Use the energy balls to kill them.
Go forth and use the red button (#35) when you see it.
When you’re up, turn around and go straight ahead.
Kill all the enemies and look around the room.
Just above the glass you’ll notice a mechanism that lacks power (#37).
Go back to the main hall and grab one of the energy balls.
Shoot it towards the mechanism and you’ll be 1/3 way through.
The door opens and enemy soldiers and Manhacks enter the room.
Get rid of them and use the new passage to go further.
At the end of the corridor grab a sheet of metal (#38) and crawl inside.
Grab another sheet of metal from the wall and enter the opening you created this way.
Kill the enemy soldiers and go forth - you’ll reach the reactor core room.
You’ll reach another reactor control mechanism (#41).
Eliminate all the enemies and grab an energy ball to shoot it toward it.
Wait for the next door to open and enter the elevator.
At the end, jump across the railing on one of the rotating platforms (#42).
you could now deal with Manhacks, grabbing them with your Gravity Gun and shooting against the walls.
You’ll end up by the final reactor control room.
Grab an energy ball from the tunnel and send it towards the mechanism.
Something will go wrong and the machine won’t function as it should.
Enter the hole and check out the situation in the next room.
There are three cables before you (#47) that are out of power.
Before you shoot the third ball in there, retreat towards the platform.
You’ll be transported back up when the power’s back on.
Grab a ball and start the final mechanism once again.
The reactor is secured - at least for the time being.
Wait for the gate to open and go forth.
Approach Alyx (#50) and then follow her.
The girl will explain you the present situation.
Run with her to the elevator.
Run straight ahead until you reach a room filled with mines (#51).
Grab one of them and approach the girl.
When the “ball” is reprogrammed, do the same with a second one.
There’re a lot of enemies in the nearby room.
Shoot both mines in there (#52) and they’ll soon be neutralized.
Alyx will deactivate the force field and kick off the way to the train (#53).
Recharge your energy if you gotta and enter it.
The ride will end with the train being derailed.
Crawl towards the girl and move the container with a Stalker (#55).
There’s a door nearby (#56).
Open it and go outside.
Crouch down and go below the pile of junk.
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