Missing in Action

Missing In Action is the fourth chapter in Opposing Force, the first expansion pack to Half-Life. It details Adrian Shephard's continued journey through Black Mesa in search of both his compatriots and an alternative escape route.

Walkthrough
Previous Chapter: We Are Pulling Out

You begin in the hole blown open by the Slave. Turn left and around at the end of the tunnel. You need to time your run to avoid being hit by the steam. At the end turn right into the next area. Slaves will teleport in as you approach. Get up onto the three pipes to the left and then into the vent. Go straight forwards, ignore the first two openings and smash open the last to drop down and get some ammo. Go back through the door and back into the vent, this time dropping out of the first vent. You'll find yourself in a foam ceiling area.

This can be an extremely annoying area. A lot of the ceiling tiles crumble when you walk on them, sending you into the electrified water below. There's nothing to tell which tiles will break so it's a sapping game of trial and error unfortunately. There's a Health generator and batteries in the flooded office below. Advance carefully through the ceiling space- when you get close enough jump to the red lighted area, the tiles here will hold you. Advance until you come to the first fan. Carefully walk down and left the narrow strip of metal, and jump across to the next strip. Across, right and jump out onto the walkway. You need to jump diagonally left to avoid the steam jet- again time it to miss the second jet. If you fall into the water, there's a ladder out at the fan end. Continue down the walkway, and then down and left. Very carefully walk along the narrow gap between the fans before jumping down to the side of the next pair. The fan on the right here is broken- you need to run and duck into the vent at the base of it.

Crawl through the vent, jump across as the flame recedes. At the next jet, wait for the flame jet to go past entirely- even a small part of the flame here will seriously hurt you- before jumping across. Get up onto the boxes and jump over the next jet and immediately turn to the right to fight a Gonome. Break the crates for supplies, crawl into the vent on the left. Exit it as the flame recedes, walk across to examine your next problem. As soon as the flame disappears, get into the pipe, run down it and quickly exit. Be ready to fight more Gonomes and Zombies. Walk around from the flame jets and left. Don't block the test flame eh? Push the explosive crate into the pipe here, press the button facing it. Drop down into the hole you create, kill the Gonome and Headcrabs. Continue down the tunnel and exit right.

Crawl through the hole next to the jeep below, continue along the corridor ignoring the skittering above. Press the button between the garage doors, quickly step back as Pit Drones will attack through them. Kill them all, step through and collect all the supplies in the garage, including the Rocket Launcher in the far corner. Follow the raised path around, fighting the Pit Drones which appear.

Eventually you will reach a corridor with a scientist barricaded in at the far end. Kill the Drone, and then jump out of the lift door on the left onto the ladder opposite. Work your way downwards, once you reach the bottom step into the crashed lift, climb out of the vent above and then through the doors. Bear left here, you will reach an electric wire dangling over a water spill. Keep to the right carefully, work your way over the boxes to the corridor beyond. Continue on to the left, open the metal door and switch off the circuit box at the end. Make your way back, avoid the spill by getting over the boxes opposite. Climb back up the lift until you reach the wire that was previously electrified. Jump onto it and grapple up to the top. Jump down onto the lift; duck down inside to pick up some batteries and then jump through the doors opposite.

This next bit is very reminiscent of Office Complex. Head down the corridor and turn left. Smash open the grate on the left, push the small box in front to get in. Work your way down. When it collapses, get out, kill the Bullsquid behind you before clambering up onto the vent and jumping into the unbroken section. Collect the batteries at the end before breaking open the hatch and climbing out. Open the red door from where you just came from, grab the box again and position it in front of the barricade in the next corridor to get over. Throw a grenade at the explosives in the room to the right, stand well back. Walk through the ruined room, collect the box and walk it through to the grate set next the barricade.

Crawl through the vent into the next room. Don't touch the unfortunate chap on the desk. Walk along the corridor, drop down the hole in the ground. Walk to the far wall from the scientist, turn the power off and grapple up the power line. Use the radio in the corner to alert the soldiers' attention, and they will blast their way in. Talk to them, and then get the Engineer to follow you to the unbroken door. Once he gets it open, command your soldiers into the lift (this may take effort- their A.I. isn't great) and activate it to end the chapter.

Next Chapter: Friendly Fire