Ever wanted to get out into their staging area?
first go to this location

punch the box and go up to the wall looking this way

there is a small crack in the middle of the pillar, wiggle into it until you stop. you'll notice that you can go left but not right, now you need to ram to the right but you have to do it in short bursts or you will fly out the other side and it will look like this and you will have to start over

you should start going into the wall now, once the edge of the wall disappers it shold look like this

now look perpendicular to the wall and press your stick all the way to the left, then wiggle it up and down about an eighth of an inch, you should go right through the wall and be on the outside.
make sure not to fall into the pits where the soilders are being dropped into, you wont be able to get out