Part 13

Navigate Part 13 of the Half-Life walkthrough. Learn how to defeat marines, avoid barnacles, and find crucial supplies on your way to the surface.

Alright, let's get through this next bit. You'll find yourself in a hallway with some marines. They're tossing grenades, which is actually pretty convenient for you. Hang back at the top of the ramp and let them take each other out. If you're feeling impatient, you can crouch halfway down the ramp and pick them off as they come into view, or try to get a better angle from the lower floor. Just keep an eye on those upper walkways – they'll sometimes run up there and get themselves killed by the barnacles.

Once the immediate threat is gone, you have a choice. You can take a shortcut over the barnacle bridge, but you'll miss out on some combat and supplies. If you're going for everything, jump onto the conveyor belt after the barnacle tongues. Follow it to a room with assault rifle clips, a first aid station, and an HEV wall. Your goal here is to get to the high-up conveyor belt. Find the lowest green crate in the big stack, then use it (and maybe the wooden crates) to jump your way up to the highest green crate. From there, make the leap to the upper conveyor belt and ride it to the next area.

Now, this next part is a bit tricky. Quicksave before you get too close to the room ahead. Move in just enough for the marine on the other side to spot you, then immediately back up near the conveyor bend. Wait for him to run over to the explosive barrels. Pop those barrels to take him out. If he gets lucky with grenades or the barrels, or if he somehow duplicates (seriously, it happens!), quickrestore and try again. An alternative is to blow the barrels as you approach, toss a grenade near his sandbag cover before he sees you, and then rush him while he's dodging.

After dealing with that marine, search his side of the room for a first aid station and some ammo. Look down to the lower floor – you'll see turrets and laser alarms. Quicksave again. Drop down next to the fire door button, go through the door, and carefully jump over the laser tripmine. If anything goes wrong, quickrestore.

Turn left past the tripmine and move forward. Look up to see a marine on an upper walkway. Shoot his legs, and he should run towards stairs leading down. There's a barnacle right over those stairs, so he'll likely get eaten. You can try to trick the other two marines into the same fate. Be careful, though – if one tries to go down the stairs too quickly after the last one was eaten, he might make it past the barnacle, and you'll have to shoot him directly. If the marines manage to kill the barnacle, stay back and try to pick them off with your pistol before they get too close. Grenades can help here too.

Once the path is clear, quickly run up the stairs. You might want to kill the barnacle with your pistol first. Look for shotgun shells on a small green crate near a sandbag wall. Continue up more stairs and along the walkway until you can turn left into a wide concrete corridor. If you miss that turn and keep going, you'll find a first aid station and some assault rifle clips past another tricky barnacle.

Head down the concrete corridor and cross another barnacle-tongue bridge. You'll end up on an upper walkway overlooking an area where you've already cleared out some marines. Go around this walkway, bashing crates for an armor battery. Find the stairs leading down to a lower walkway, then more stairs to the floor where the marines were. Bash all the crates down there for more supplies. Finally, locate the big "SURFACE ACCESS" lift at the back and use its button to open it. Get on and use the interior button to head up to section c1a3b.

Section c1a3b: BRIEF SURFACE RUN

Sometimes the lift glitches and seems to jam after loading. If that happens, just crouch and move around a bit to break free. Once the lift stops, crouch-hop onto the floor past it. Turn left and make a run for the corner with the first aid station on the wall. Stay to the left as you run, and you should make it past the outside marines without being spotted.

After quicksaving, go through the left side of the large doorway. Immediately turn left again and run past two sets of wooden crates. Turn right and head for the open door past another set of crates. It might be easier to crouch as you drop down to this door, as it's on slightly lower ground. As soon as you're through, climb down the ladder to reach section c1a3c.

Section c1a3c: DROPPING DOWN A SHAFT

Finish climbing down the ladder. Quickly bash the crates nearby for ammo, and use the first aid and HEV stations to top yourselves off. Move to the vent access door to open it. Back up a bit – a large explosion will send debris down the shaft past the door.

There shouldn't be any marines left in the shaft after that, but be ready with your assault rifle just in case. Move through the vent access door and drop down to the ledge on the right. Turn and try to drop onto the broken fan before falling to the metal walkway below. Find the large opening in the wall next to the walkway and run down it to return to section c1a3.

Section c1a3 (again): CRAWLWAY EXTRAS AND SILO DOOR CONTROL ROOM

When you reach the end of the shaft, quicksave before attempting to drop onto the narrow ledge below. Move along the ledge and enter a vent shaft. Go forward until you see an opening on your right. Drop down onto a green crate, then turn and crouch-walk under an unbreakable vent grating to grab some shotgun ammo. Crouch-jump back onto the green crate.