I can no longer travel the walkway; security sees me and kills me.

Hint 1 of 33:

You will reach a point in the game where you are a fugitive from security. 
You are no longer free to walk all of the open corridors.  There is a "shoot
to kill" order out on you.

Hint 2 of 33:

This is most prevalent when trying to walk around the Administration level. 
You'll need to find other means of navigating around the various locations on
the Administration level.

Hint 3 of 33:

There are other means of travel available to you in this open area.

Hint 4 of 33:

Think McGyver; think James Bond; think...  Tarzan.

Hint 5 of 33:

Look out into the center of Level 2 (the Administration level).  What do you
see?

Hint 6 of 33:

There is a power station of some kind suspended in the middle of this
gigantic area.

Hint 7 of 33:

The power station is suspended from cables.  The cables are anchored in the
rock at various points around the outside of the Administration level.

Hint 8 of 33:

One of those cables anchors right above the oxygen generator at the end of
the Administration walkway.

Hint 9 of 33:

To the left of the oxygen generator, there is a ladder.  Climb the ladder and
look out over the center area, and you'll see one of the anchor cables
immediately overhead.

Hint 10 of 33:

Now, if you could only make your way out across that cable to the power
station...

Hint 11 of 33:

You can't crawl out.  You need something more dramatic.