After the cutscene listen to the radio chatter and read the tutorial message on how to crouch then turn back the way that you came in. Kill the human enemies that appear. Pick up the supplies on the floor and move foward through the door in front of you. Kill the soldiers that come into the room and pick up the supplies they drop. Then head left, straight up a set of stairs and turn left and listen to the radio chatter. Then head right and keep following O'Neal.
He will lead you down two sets of stairs.Read the tutorial message regarding grenades and pick up the supplies. Head into the cargo rail room on your right and shoot the soldier firing at you from across the room and he will retreat locking the door behind him.
Listen to the conversation between you and O'Neal and jump into the Powerloader. Read the tutorial on how to operate the Powerloader. Move straight to the the other side and use the Powerloader's arm to lift the door open. You will then automatically exit the Powerloader. Move foward and turn left near an alien pod to find ammo and a dogtag. Move foward and turn left to find a full suit of body armour. Turn back and head into the doorway which has two alien pods in front of it.
Turn right then left and then turn left again for your appropriate introduction to the Facehugger. After dealing with the Facehugger turn right to find an audio log and ammo but before you pick up the items be sure to turn around and kill the facehugger that tries to jump you.
Head into the opposite direction and cut open the door on your right. Step inside and shoot the Facehugger that appears. Head right into the next room then left and again left and kill another Facehugger that appears. Keep moving foward and before you exit kill the Facehugger that appears.
Turn left past the alien pods and turn right and kill one more Facehugger. Turn left twice and pick up the ammo in the next room. Turn right into the Quartermaster. Turn right again into the Control room. Watch the cutscene. After the cutscene Bella will join your team.
Listen to the radio chatter and keep moving foward. Cut through the door in front of you. Listen to more radio chatter, move foward and turn right and move foward some more. Follow the blood trail on the ground. This wiil lead you to a full suit of body armour and a dogtag.
Turn back towards the way you came and look straight to find some ammo. Turn right and up a small set of stairs. Turn left and follow your teammates and cut open the cargo rail door. Move in and pick up the pieces of armour if you need to. Then move down a set of stairs.
Listen to the radio chatter. Move foward in the huge halway. Shoot the soldiers that appear. Keep moving foward all the while shooting the soldiers and picking up supplies. Listen to the radio chatter, turn right and pick up the supplies in front of you. Go through the door on your left.
