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I'm at the end of the first section of nova prospect (I suppose) I killed all the combine along the coast. Made it towards the end, I look up, and there are more atop this huge tower that has a sewer entrance, but it's caged. So I ran the opposite direction jumped a clif with a wood stuck in it. I reached a small inclave with zombies, killed those bastards, and went forward from there to the 2nd level of the tower. Killed the combine, went up the ladder, and now I'm stuck. I can't go up any further.

Any help would be apperciated.

Thank You.

Take Care.