You will regain control of Marcus on top of a moving assault derrick aptly named Betty, and you will be defending said drilling platform until the end of the mission. There is a turret up the front of the vehicle that can be used and a walled lower platform below.
Soon after leaving the staring area, the convoy will start getting hit with mortars. After the derrick to the left is taken out and the helicopter in front of you gets hit, Betty is next. So head up to the turret and shoot down the incoming nemecyst before they hit the rig. If you take too much damage, the mission will be over. After taking down around ten nemecyst, the rig in front of you will be attacked and destroyed by reavers. Shoot them down as fast as possible before they take you out too. Then you will have a few moments of silence, leave the turret and go and pick up collectible (1/2) near the unusable ladder on the rig.
As you reach the top of the hill the driver will lose control of the vehicle. You have to make an emergency stop and repair. Following a quick scene, Delta will be on the ground and tasked with defending the rig while it gets fixed. As soon as you regain control, run over to the left for some ammo, grenades and collectible (2/2).
Then head over to the debris in front of the rig. As you do, an emergence hole will appear. Seal it up with grenades if you can and kill everything that pops out of it. Soon after another emergence hole will appear to the right of the first. Defeat these bad boys and yet another emergence hole will appear, this time on the ledge above and to your right. As you are fighting these guys one last emergence hole will make itself known right next to the first one. As soon as Dizzy says its ready, run back to the ladder to escape the baddies below.
