Part 23

Past the railing and crates, use your flashlight or crowbar to locate a Bullsquid. Strafe to avoid its spit.

Enter the Bullsquid's room via a short hallway, crowbarring a Barnacle. Jump-crouch onto a green crate for a C4 satchel bomb, then smash wooden crates for bullets and hand grenades. Return to section c2a2a.

In section c2a2a, board the rail car and ride forward until an incline. Stop just past it and jump onto the narrow ledge to the left. Bash crates to find .357 ammo.

Past the track branch to the right, stop the car and get onto the narrow ledge to its right. Crouch-walk down the track branch to its end. Shoot a Headcrab ahead with the pistol.

Return to the rail car and ride around the next corner. Crouch to avoid an electrical wire. Slowly move forward to shoot two Houndeyes to the left.

Move the car forward until its front is past the track switch. Edge over to see a Bullsquid around the corner. Sneak-shoot it with the pistol until it leaps.

When the Bullsquid leaps, an elevated turret will activate. Keep shooting the Bullsquid to make it jump again, allowing the turret to kill it.

Ride the rail car forward to take down the turret. Shoot it in the leg with the pistol until it's destroyed.

Ride the rail car around another corner and stop at the four-way track intersection. Get out on the right-hand ledge and follow it to its end. Look for a Bullsquid in a side area ahead and to the right, and sneak-shoot it with the .357.

Get back on the rail car and ride until near the next track switch. Shoot the switch with the pistol to make the car go straight. After passing the switch, decrease speed until after rubble falls. Speed up again, watching for a platform on the right with a Bullsquid. Stop the car so the Bullsquid is behind a pillar and shoot it with the pistol.

Move the car to jump over the platform's side rail and find a ramp to a lower floor. Dive into the water to find a .357 Magnum and an armor battery next to a dead marine. Move on the surface to avoid leeches, diving only to pick up items. Climb the ladder to exit the water.

Quicksave, then jump over the rail track where it slants upward. Move past it to find two crates with an armor battery and hand grenades. Return to the rail car, ride forward slowly, and kill a Barnacle with its tongue hanging over the track.

Ride the rail car to the side area where you previously shot a Bullsquid. Park the car and watch near the stairs for a Headcrab. Kill it, then get off the car. Find a first aid station and items near dead marines. Go up the stairs, bash crates for a .357 Magnum, and clear the passage to the room with the turret you shot down.

In that room, use a switch to move the crane blocking the exit route near the first track switch. Return to the rail car, ride to the track switch, ducking the live wire. Shoot the switch to flip it, then ride past the moved crane until section c2a2b1 loads.

In section c2a2b1, move the car slowly forward until you see a marine's legs on a higher walkway. Shoot the legs with two .357 bullets to kill the marine. Carefully move the car forward to get off onto a lift, but do not move it far enough to activate the lift and fight two additional marines.

Climb the ladder that leads up.