Part 45

Activate the nearby ceiling turret (a defensive emplacement that fires at enemies).

If the turret cannot see aliens, crouch near its controls and fire hornets (a type of projectile weapon) through the windows to hit them. The turret will fire at your hornets, keeping it alert.

After the first aliens are defeated, more will teleport in. The turret should eliminate some before being destroyed.

Use hornets to finish off any remaining aliens, crouching for cover (a defensive position) to avoid return fire.

If firing hornets through windows is ineffective, crouch-walk to the doorway and fire hornets through the left end of the red railing. Avoid being seen by alien grunts.

Once all aliens are cleared, turn off the turret if it's still active. Slowly approach the control room's windows, ready to shoot any remaining enemies.

Jump-crouch through a window or jump over the railing into the control room.

Find the gauss gun ammo (ammunition for a powerful weapon) inside one of the wooden crates that you destroyed with hornets.

Be aware of a potential alien grunt behind the green crates to the left of the big ramp. Sneak-shoot it with the crossbow (a silent ranged weapon) if present.

Go down the big ramp and turn right.

Use altfire hornets (an alternate firing mode for the hornet gun) to destroy an explosive crate.

Fire regular hornets to go around the corner and hit the vorts (a type of enemy) in the next room. This should kill the two vorts in the open.

For the vort hiding near the bottom of some steps, either use hornets before it sees you or charge it with the shotgun or assault rifle.

Position yourself to use altfire hornets to shoot the glowing snark pod (a hazardous explosive device) over a hatch past the walkway.

As soon as the snark pod breaks open, run to the base of the big ramp and wait until you no longer hear snark noises.

Use altfire hornets to destroy the snark pod down the path to the left of the ramp.

Run to the hatch where the first snark pod was and wait for these snarks to self-destruct.

Go past where the snarks were to find a vine-covered side area with stairs. Bash through the vines.

Destroy the snark pod at the top of the stairs and quickly run to the safe hatch area to wait for the snarks to time out.

After the snarks self-destruct, go back up the stairs to reach an upper walkway with a first aid station (a health replenishment point).

Go back down the stairs and look left to find more vines. Bash through them.

Uncover another snark pod but do not destroy it immediately. Use altfire hornets to bash through vines past it.

Use altfire hornets to blow up a stack of explosive crates. The explosion will break the snark pod open.

Run to your safe spot at the hatch and wait for the snarks to time out.

Past the blown-up crates is one last snark pod near a ramp leading down. Use altfire hornets to hit it and run for the hatch.

Return and check out the fenced-in side room near the top of the ramp. Push the fence door open.

Inside, find an RPG (a rocket-propelled grenade launcher) and a spare rocket next to a dead marine.

Use the hornet gun's altfire mode to kill the barnacle (a hanging creature) in a corner before collecting the snark pack (likely a health item) underneath it.

Go down the nearby ramp and look into the room beyond.

Use altfire hornets to destroy the rightmost wooden crate visible on the other side of the room.

This will reveal the shoulder of an alien grunt behind the crates. Fire regular-fire hornets slightly to the right of the crates so they will swerve into the grunt.

When the grunt starts moving, strafe left to a position partway up the ramp so it cannot see you. Continue shooting it with hornets around the corner until it is dead.

Crouch-walk past the left side of the two nearby green crates, turn right, and move toward the alien whoosh-thing (a device for traversal).

The other grunt is behind the large stack of green crates. Get to where you can see part of it.

Quicksave (save your progress). Blast the grunt carefully with two RPG rockets.

If you take damage, quickrestore (load your last save) and try again after backing up.

As soon as that grunt dies, another grunt will teleport in near the bottom of the ramp. Edge over to where you can sneak-shoot it to death with hornets.

Bash open the remaining wooden crates in the room with the crowbar (a melee weapon) to find supplies.

Use the whoosh-thing to get onto a narrow ledge with snarks and a health pack.

Turn to face the top of the green crate stack and run forward to drop onto it.

Collect the Crossbow (a silent ranged weapon) and gauss gun ammo.

Drop down to the floor and return to the fenced-in side room to resupply on RPG rockets.

Go back to the hatch you found earlier.

Optionally, dive in the water near the hatch to find a dead marine with an armor battery (a shield enhancement), two assault rifle clips (ammunition), and AR grenades (explosive projectiles). Be aware of leech worms in the water.

Use the wheel to open the hatch and climb down the ladder to reach section c3a1a.

Upon reaching section c3a1a, shoot the headcrab (a small alien enemy) through the ladder with your pistol.

After getting off the ladder, move through the red laser alert.

Quickly move to where you can only see the leg of the turret ahead.

After the turret finishes shooting the headcrab near it, shoot the turret down with the pistol.