Help! I'm Stuck

[berzerker]

got the thing that makes the antlions follow me! killed everyone
one the turrets followed the trail up the side of the mountain
went into a sewer tunnel came up where there are three guard
towers killed everything there an alarm is sounding I see a sign
that says nova prospekt but nothing happens after that! I've looked around for two days still can't find a way to continue.
Please Help! want to keep playing but can't figure it out

 

[westie]

Im there too and those fecking gunships kill me. i don't know where to go i havent really looked.

 

[chriso20]

if you're still outside:

After you see a pipe thing going up the cliff face with some guys on catwalks, just climb the ladder, then jump onto the trail again (there's some boxes) and you get to some zombies under a wooden shelter thing. Kill them then knock out the legs of the shelter to make a ramp. Walk up it.


If not that then post a screenshot

EDIT: If you're at the point where there's loads of guard towers and a gunship or two. First kill the gunships then they'l blow open a hole in the wall. Climb through. (the hole is in the furthest area you can get to, next to a guard tower).