basically your meant to climb along a pipe.. but its too hard/doesn't work..

What you wonna do is jump into the sea; swim across to the stairs to the right of the oil rig (if you were facing it head on)... go up the stairs until you reach a flat pillar (with two lines running up it... looks like some kinda elivator could have been there) Use your ferral vision and climb up.....

Kill a load of people up there and then enter the room at the far back (you have to kill pretty much everyone for the door to open)

Since my last post... when i was replaying i have had this problem before... it seems to be a bug.... i had to restart the level... then everything was fine..

This game does crash alot yes....