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At that point the only thing you can do is reset. Also, as a side note, if you don't use up any of your rockets and conserve your SAW ammo on the way down you can get that last room done without leaving the tunnel. It takes a fair bit of patience but its quite doable.
"Have you seen the posts around this board. You HAVE to act like a child to get attention around here." - AlabamaMan79