Part 38

Move along until you approach the open end of a large pipe. A headcrab is inside; strafe in front of the pipe and quickly strafe back out to make it leap to its death.

Enter the pipe and proceed until you reach section c2a5b.

At a path split in the pipes, turn right and go forward to drop into a watery alley-like area.

Run forward and jump-crouch into another pipe entrance, then turn right past it.

Go to the end of this pipe and climb the ladder just enough for a nearby marine to see you.

Quickly climb back down and go all the way along the pipe to its other end.

Use the nearby ladder for a quick peekaboo routine to provoke the nearby marines.

Get back in the pipe and move to the corner near the first ladder you used. Wait here while the marines above attack each other, eventually destroying their own tank.

After the explosions and radio chatter cease, ascend the first ladder to reach the area behind the tank.

Use your assault rifle to destroy the tank's turret if it is still intact and eliminate any surviving marines.

Look for supplies behind the tank, including an ammo stash with rockets and C4 satchels, and two small open garage rooms with first aid stations.

In the area in front of the tank, find assault rifle clips and AR grenades near the sandbag walls.

Locate the blinking red-and-green button in the small shed to the left of a large metal door. Use it to open the door.

Before approaching the corner past the door, quicksave. A rocket-firing tank is ahead; prepare to sneak-attack it.

Equip the Crossbow, enter zoom mode, and carefully round the corner towards the crates.

Move slowly toward the crates until you can see the very top of the rocket tank's turret over a crate. Do not move close enough for it to see you.

Fire six darts into the tank's turret to destroy it. (Note: It requires 12 darts and aiming slightly above the turret).

Alternatively, to trick the tank into destroying itself: crouch-walk around the corner, stay crouched, and move along the right wall, bashing crates.

After bashing the second crate, move to the explosive crate, stand up, and run past it on its right side.

Immediately turn left and run for the sandbag wall to the left of the tank.

Quickly crouch-walk between the tank and the sandbag wall and wait for the tank to blow itself up. Adjust your position if its rockets are not damaging it, ensuring you remain crouched and behind the sandbag wall.

Alternatively, stand next to the tank and bash its turret with the crowbar until it explodes. You can also shoot out the turret with the pistol.

Return to the first tank's area to resupply on bullets if needed.

Bash non-explosive crates on the street to find supplies, including ten hand grenades.

Approach the large hole in the wall near the tank. Toss five hand grenades through the hole towards the marines in the lower area.

Jump-toss several snarks through the hole and wait a few seconds.

Jump through the hole, crouch-walk forward to the lower area with your assault rifle equipped, and shoot any surviving marines.

Look for supplies in the lower area, including five hand grenades.

To exit the lower area, go to the end with the sandy slope and climb up.

To return through the wall hole, run up the leaning wall piece next to it and jump through.

Squeeze between the right side of the tank (your left) and a sandbag wall, or jump-crouch onto the sandbag wall.

Move on to reach a large metal door that slides open as you approach. Go through it and wait for it to close to reach section c2a5c.

In section c2a5c, wait for the second metal door to open, then move forward against the left wall.

Shoot the vortigaunt in the head when it appears to your right.

Quicksave, then toss a hand grenade to where the alien grunt is on the left without being seen.