Half-Life/Unforeseen Consequences

Unforeseen Consequences
Unforeseen Consequences is a moderately short stage that should be rather easy for most players. It takes place after the incident in the Anomalous Materials labs and the Black Mesa sewer system, where you must find an escape route.

You'll begin in the test chamber, destroyed after the experiment. Start off by going through the large brown doors to the right, where you will see one of your fellow scientists dead. Walk up to the eye scanner that's to the right of the doorway and activate it by pressing your use key. It will start to sputter, but the door will open anyway.

In the next room you'll see a scientist attempting CPR on a fallen security guard. Eventually the security guard will come back to life, and you can make him follow you. However, it is useless to do so, since the security guard or the scientist will not get on the elevator.

Now take a right from the test chamber entrance. Be careful though, because a machine will fall on a dead scientist, resulting in his "destruction." Anyway, take a left at the hallway intersection to get to the small elevator.

This elevator will lead back to the room where the equipment was destroyed. One of the scientists is hurt, and you need one of them to unlock a door. Have the scientist on the right follow you (by pressing your use key) to the Control Room where he will unlock the door. In the original Half-Life, he will stay with the hurt scientist, but in the Source version, he can keep following you. It's useless to have him follow you, so it's not suggested.

In the Control Room, walk past the fallen scientist's body to trigger a large lightning bolt to come from the test chamber. This lightning bolt will take a lot of damage from you, so you must avoid it. Do so by hiding behind the small black control panel in the corner, and wait until the lightning destroys the doorway. Time your movements and quickly run past the doorway. A loadzone will trigger once you go past the door.

Follow the hallway passage until you get to the water pump room. A headcrab will spawn and fall near the first pipe. Run as fast as you can to the next doorway to avoid being hit by the headcrab. The floor will be slippery in here, so be careful.

The next area is the laser storage room, and you guessed it, the lasers escaped. Immediately crouch down and walk toward the dead security guard. The lasers should stay above you most of time, so you should have no problem not getting hit. When you reach the end of the hallway, you'll see what happens when a security guard and a laser meet. Anyway, grab the crowbar that's next to the doorway and smash the bottom right glass pane. Crouch under the glass pane to get to the next room.

Now walk up to the elevator doorway and smash one of the bottom glass panes again. When you step through, a group of scientists fall to their doom (you can also press the elevator switch to cause this event). Now climb down the red ladder to the right to go to the bottom. In the corner is a battery, so pick it up. Climb back up the ladder to get to the platform. Now climb up the ladder labeled 'Maitnence Access' to get back to the lab's top floor.

When you reach the top floor, you'll immediately see a security guard engaging a zombie. Help the security guard by stabbing the zombie with your crowbar. Another zombie will come from the right passage, but the security guard should be able to handle that zombie no problem.

Now you'll get your first taste of having a security guard following you. Have him come with you and step through the next doorway. You can kill him with your crowbar too to take his Glock pistol, but having him kill the enemies is much safer.

When you step through the next doorway, a loadzone will trigger. Keep following the blue panel and you'll encounter two zombies in the hallway. Have the security guard kill both zombies (they shouldn't reach the security guard in time. If they do, kill them immediately).

Now keep following the blue panel to get to the corridor. Before we go back to the main entrance, let's go back to the lockerroom. You can grab two clips for the pistol in the open locker (with the American flag). Go to the locker labeled 'Freeman' to pick up two batteries, and use the health station in the bathroom if you need to. Now go back to the corridor and take a left, where a loadzone will trigger. Follow the passage to get back to the main entrance, which is now destroyed.

The security guard should kill the headcrab that's near the small vent. Have him wait at the main entrance (by pressing the use key again) and walk up to the small control panel next to the large brown doors. Smash the control panel with your crowbar and go on through. Wait for the next door to open (you'll have to crouch down to go through) and walk up to the scientist. Step backwards immediately, as the bridge will collapse. Grab the clip next to the fallen security guard and go back to the main entrance.

The security guard that you left behind serves no purpose now, so you can either kill him for extra ammo or just leave him there. Now crouch under the small vent to go into the next room. Use the nearby healthstation if you have to. There's another vent in the top right corner which we need to get to. Jump on the first fallen machine that's blocking the doorway, and then jump on the one in front of it to get to the vent. Crouch under the vent and go down into the next area.

Avoid the fallen vent in the corner, as a headcrab will jump out of it once you get close. Near the vent is the famous headcrab vs. scientist scene, and the room across from here has a rather frightning display. Now go through the passageway to see a dying security guard. Grab his Glock pistol nearby (you may already have one if you killed the first security guard). Now take out your crowbar out and crouch under the left glass pane to proceed to the next area.

Press the switch next to the door to open it. It will slide back and forth, so time your movements to go through it. Now make sure you have your crowbar out. Take a right at the door and a houndeye will spawn. Start stabbing it with the crowbar as fast as you can. Now take a right from the intersection, and another will spawn. Do the same. There's a scientist nearby, but he can't go far, so there's no use in having him follow you. Take the left passage from the intersection, where two houndeyes will come. Stab the one closest to you, and then immediately start walking backward to avoid the other's sonic attack. When the second one has finished it's sonic attack, run up to it and start stabbing. There's a healthstation in the room with the red light, so use it if you have to.

Now go up to the door with the yellow hazard sign. Open the door and a headcrab will jump out of nowhere. Kill it immediately, and then follow the narrow passage. Take your pistol out before you go up the ladder. Climb up the ladder so you can see the large explosive tanks, and then shoot them. This will kill the zombie and the two headcrabs that are nearby. To the right of the ladder is a passage that leads to a scientist. Have him follow you to the narrow walkway (which leads to a storage room) on the left, where a zombie is having it's dinner. Kill the zombie and then have the scientist open the door for you. Inside is three clips of pistol ammo, ten grenades, and a healthstation. Now jump down from the walkway and go down the passageway labeled '19.'

Take your grenades out and start walking backward from the brown door. The brown door will start to be ripped apart by a Vortigaunt. As soon as it's destroyed, throw a grenade in there to kill it. Pick up the two clips of ammo that are in this room, and then kill the headcrab that's hiding behind the barrels. There's also a healthstation behind the dumpster (and a scientist inside of the dumpster) if you need it.

Go near the small opening and a zombie will emerge from behind the gate. Either throw a grenade in the room or start shooting the zombie to kill it. In the original Half-Life, a headcrab is directly under the opening. Throw a grenade down to kill it. However, in the Source version, the headcrab is not there, so you don't have to worry about it. Now drop down into the opening and follow the right passageway until you see a valve handle. Start turning the valve handle and water will start to rise. Swim up to opening where the zombie came from to get to the next area. Follow the passageway to get to a huge elevator.