God Damn Frick!!

[Lyrical_Massacre]

how do you get past the underground tunnel, its like near the end...your in a tunnel and there is lotza sludge and cars and zombies and you jump on this pipe and there is 4 vents but all of them are dead ends!!!!

 

[CyberPitz]

screenshot? cause you just made no sense there

 

[SaiboT]

I think I know what you are talking about.
If you see the vents, use the manipulator to take one off or smash it with a crow bar. Each vent leads to the same place.
Don't know how you are stuck there...

 

[Mr. Redundant]

fight your way to the other end, turn around so that you are facing the way you came from, look right there are some pipes, walk up those then as Saibot said, break the vent and the rest should be self explanatory.

 

[Lyrical_Massacre]

No it's like a dead end place....and it's full of toxic waste...and zombies rise out of it and you have to franticly scramble across brokeb bits of cement and cars and burning junnk lol and its like a dead end everywhere....

 

[h00dlum]

i think i know what you mean..when u enter the dead end vents..look down..you can go down in the vents..

 

[Cyphersphere]

at the end of the tunnel there is a slanted set of pipes against the wall. After you fight your way through you take the pipes leading up to the ventilation system. just smash the vent at the end with your crowbar.