Part 23

In the room past the railing and crates, locate the bullsquid. Use your flashlight or crowbar for a better view, but be ready to strafe to avoid its spit.

Use the short hallway to reach the squid's room. Crowbar the barnacle in the hallway.

Jump-crouch onto the large green crate to get the C4 satchel bomb. Smash wooden crates nearby for bullets and hand grenades. Return to section c2a2a.

Back in section c2a2a, get on the rail car and ride forward until you go up an incline. Stop just past the incline and jump onto the narrow ledge to the left of the track. Bash crates to find .357 ammo.

Proceed to the track branch to the right. Stop the car just past it and get onto the narrow ledge to the right. Crouch-walk down this track branch until you reach its end.

Sneak to where you can see a headcrab ahead and shoot it with the pistol.

Return to the rail car and ride around the next corner. Crouch to avoid a dangling electrical wire.

Move forward slowly to spot two houndeyes to the left. Stop the car and shoot them with the pistol.

Move the car forward until its front is past the track switch device. Edge over until you can see a bullsquid around the corner past the switch.

Sneak-shoot the bullsquid with the pistol until it leaps. When it jumps, a nearby elevated turret will activate. Keep shooting the squid to make it jump until the turret kills it.

To take down the turret, slowly ride the rail car forward, looking up at the elevated walkway. Shoot the turret in the leg with the pistol until it is destroyed.

Ride the rail car around another corner and stop it just past 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. Use the .357 to sneak-shoot it.

Get back on the rail car and ride until you reach the next track switch. Shoot the switch with the pistol before reaching it to ensure your car goes straight.

After passing the switch and turning left, decrease speed until after large rubble falls. Speed up again, but watch for a platform on the right with a bullsquid. Stop the car so the squid is mostly behind a pillar and shoot it with the pistol.

Move the car to jump over the platform's side rail and find the 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 locate items. Climb the ladder in a corner to exit the water.

Quicksave. Carefully jump over the rail track where it starts to slant upward. Move past this to a spot with two crates. Break them open to find an armor battery and hand grenades.

Return to the rail car and ride forward very slowly. Kill the barnacle with its tongue hanging over the track using the pistol before passing under it.

Ride on until you reach the side area where you previously shot down a bullsquid. Park the car and watch near the stairs for a headcrab. Kill it, then get off the car.

Look for a first aid station and items near dead marines (including under the stairs). Go up the stairs, bash crates to find a .357 Magnum, and clear the passage to the room with the previously shot-down turret.

In that room, use the switch to move the crane blocking the exit route near the first track switch.

Return to the rail car, ride until you reach the first track switch, and duck the live wire. Shoot the switch to flip it.

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 them with two .357 bullets to kill the marine.

Carefully move the car forward to get off on its right side and onto the lift. Do not move the car far enough to activate the lift to avoid fighting two additional marines.

Climb the ladder that leads up.