Gothic/Secretion of the Minecrawlers

After you give Cor Kalom the focus, he will tell you that the Sleeper has told him he needs a stronger secretion from the Minecrawlers in order to contact the sleeper. He will tell you that the answers could lie in the Old Mine. Go there now.

Apparently the minecrawler mandibles dont contain a strong enough secretion to contact the Sleeper, so you must find the alternative. Once you get to the Old Mine, you should see some templars standing outside. One of them, Gor na Drak, will teach you how to get the mandibles from the minecrawlers. Do this, minecrawler mandibles will come in handy later.

Once you get inside the old mine, Drake, one of the Guards, will stop you and tell you about the mine. If you give him a beer, he will tell you a couple of tips about fighting the crawlers.

Anyway, head to main shaft, do all the sidequests if you haven't done them already, and then talk to Ian. He will tell you that their masher broke down and he needs a new gearwheel. He tells you that he's clueless about where to get a new one, but suggests you try a sideshaft with a broken masher.

Head over to the bottom of the mine, go through the small passageway with one guard standing in front of it. There should be two ladders and a giant machine with 3 crawlers standing around it.