Follow the giant tunnel up until you find a fog-covered room through a smaller entrance to the left enter the area and take the left path. Walk up the ramp and you will see a bunch of giant blue containers, go past these and up the hill to a second area filled with the same type of containers, you will hear someone talking from within one of the pods here, so go and investigate it.
After the cut-scene follow the squad through the exit and carry on down the ramp into another large prison-like area. Look on the right side of this area to find collectible (1/1). Ahead of you, you should see something Baird refers to as a 'beast barge'. This is our next target. Head forward through the prison area towards where you saw the barge. As you reach its location, it will stop and a couple of drones and a boomer will disembark and head down the ramp in front of you. Kill these and then run up the ramp and board the barge.
Once you are on board take cover as soon as possible. At the front end of the barge, a grinder will come down a lift with a mounted mulcher (a very heavy machine gun) and will drill you if you are in the open. Dispatch him, and then take the lift upwards. When you get off, press the switch on the pillar directly in front of you and then head up one of the sets of stairs at the back of the room.
On the top deck, kill the two grinders and a reaver will fly in. If you picked up the mounted mulcher, you will finish it off in seconds! When everything is dead or dying, grab some ammo and move towards the opposite end of the deck. You see a troika turret here, do a quick 180 degree turn when you reach it and pull the lever to start up the barge. As soon as you start moving, mount the troika and kill any incoming reavers.
After a short, but sweet ride, you will stop next to another barge. Unfortunately for us, this one is filled with locust soldiers. Eliminate the drones on the top deck of the adjacent barge, and then board it. Make your way to the front part of the deck, and descend the stairs. Activate the switch on the pillar in this room for a quick cut-scene.
Following the cut-scene Fenix will be on the bottom deck of the barge and there are some bad guys shooting at the squad from a rocky outcrop to the left. After a few seconds, the wooden boarding platform will drop down. Once everything up on the platform is dead, climb up the platform. Follow the passage here around to the right and continue along the path until you reach a large column to the right of the path. Around this area you will get attacked by drones and a grinder heading up the ramp. Fight your way down the ramp killing everything in your way.
At the bottom of the ramp, Marcus will contact Anya and report the situation. After said conversation, head through the prison area here until you see a wooden ramp in a vertical position. Ignore it and continue round the corner here to the left and into the fog-shrouded passage way. Follow this and you will be attacked by a kantus and some drones. As you get closer some tickers will also get involved, so be careful. Defeating these enemies lets you continue on until you reach another area filled with ruined buildings.
Take cover behind the damaged car and kill the drones that come at you. Polish them off and move up to the concrete barriers blocking the street. Kill the kantus and drones further down the street and then head down the street towards their corpses. Take a left at the first intersection and kill the reaver that comes in to pay you a visit. Take the right hand path here under the destroyed overpass and clear the area of locust. Continue past the burning gas station in front of you to a large building resembling a hotel. We will now be using the roof of this building as an extraction point.
Head around the right side of the large building and scale the stairs at the back, take the first left and vault over a fallen concrete block. Continue up the stairs behind it and run to the centre of the rooftop to get a checkpoint. After which Carmine will lay down some green smoke to signal a helicopter for evacuation. Unfortunately, it summons a huge number of locust at the same time.
Now all you need to do is hold of the locust for about a minute or so until the helicopter arrives. All you need to do is stay alive! When the countdown reaches zero you will complete the chapter with a cut-scene.
