A1: In the questions and answers here I put the first part of the level as you start on the oil rig pipeline,its just obsticles so quite easy.
after you get thru the pipe the end part go up the ladder and open the trap door,once outside turn around and walk towards the ladder on the pole to the right and climb all the way upto the top.
step onto catwalk and over to the box by where water is dripping,climb on box and jump up to grab the pipe overhead,pull your legs up and go across to where the guard is walking underneth,use night vision.
then drop on him.head left after down the catwalk and save.
after explosion you see 3 guards dont engage just yet.wait for 2 to walk away then grab or shoot the other guard remaining,then slowly walk to the area where other 2 guards went,follow them but dont let them see you.you need to follow the technician without being detected,as you get round the corner wait for 1 guard to be left then either shoot him or get past him,then walk to door and listen to conversation with guard and technician,when they leave walk into the 2 rooms and get your medkits.
run past the guard by the fire,jump onto the red machine then jump up again grab pipe legs up crawl into the room,you can kill soldier in here pick up ammo and medkit,then walk out of the room to the left and go up stairs.after cutscene look to your left side theres a guard put some lead in him.then wait 2nd guard comes running down the stairs to the left do him the same,then run to the right run down stairs thru the cyclone door.
shoot the guard inside open door to your left,then run to the door next to red light,you have 75 seconds to find the technician.run to left of pipes then make another left to find the technician grab him interrorgate him then knock him out and search his satchel to get data stick,grab the briefcase then mission ends....