Part 38

Proceed through a large pipe until you reach section c2a5b. A headcrab can be lured to leap to its death by strafing in and out of the pipe.

At a path split in the pipes, turn right and drop into a watery alley.

Run forward and jump-crouch into another pipe entrance. Turn right past it and go to the end.

Climb a ladder just enough for a marine to see you, then quickly climb back down.

Travel to the other end of the pipe. Use another ladder for a peekaboo routine to agitate nearby marines.

Retreat to the corner near the first ladder and wait for the marines to destroy their own tank with grenades.

Once explosions and chatter cease, ascend the first ladder to access the area behind the tank. Destroy the turret with the assault rifle if intact and eliminate any remaining marines.

SRC: Marines typically need line-of-sight. Flank the tank, eliminate the marine on the left, and prepare for others to approach. Use AR grenades or rockets for this. If they stop, attempt to sneak-shoot them.

Search for supplies behind the tank (ammo stash with rockets and C4, first aid stations in garage rooms) and in front of the tank near sandbag walls (assault rifle clips, AR grenades).

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

Quicksave before proceeding through the door and approaching the corner. A rocket-firing tank is ahead.

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

Slowly move towards the crates until you can see the top of the rocket tank's turret over a crate. Avoid being seen. If you fail, quickrestore and reposition.

Fire six darts into the tank's turret to destroy it. SRC: It requires 12 darts; aim slightly above the turret.

Alternative Strategy: Crouch-walk around the corner, staying crouched along the right wall, bashing crates. After the second crate, move to an explosive crate, stand, and run past it on its right. Turn left and run for the sandbag wall left of the tank. Crouch-walk between the tank and sandbag wall, waiting for the tank to self-destruct. Adjust position if rockets aren't damaging it, staying crouched and behind the wall.

SRC: Squeezing between the tank and sandbag wall is difficult, but the tank won't fire at close range. Alternatively, stand next to the tank and bash its turret with the crowbar until it explodes. You may also shoot the turret with a pistol. Return to the first tank area to resupply bullets if needed.

Bash non-explosive crates for supplies, including ten hand grenades.

Approach the large hole in the wall near the tank. Toss five hand grenades into the lower area where marines are located.

Jump-toss several snarks through the hole and wait.

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

Gather supplies in the lower area, including five hand grenades.

To exit the lower area, climb the sandy slope at the end. To return through the wall hole, run up the leaning wall piece and jump through.

Squeeze between the right side of the tank and a sandbag wall (or jump-crouch onto the wall) to reach a large metal door that opens as you approach.

Proceed through the door and wait for it to close to reach section c2a5c.

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

Look right for a vortigaunt to appear and shoot it in the head.

For the alien grunt on the left, quicksave, then toss a hand grenade to its location without being seen.