Bury Those Cockroaches!

North, south, east and west. Those are the locations that you should be concerned about. Surrounding this fortress, within Mightstone Quarry, are four perfectly situated Nerub'ar sinkholes. <Holgoth hands you a bundle.> Be very careful with that package, <name>. Mishandle it and you'll be dog meat. Inside the bundle are seaforium depth charges. Get to each of those Nerub'ar sinkholes and plant a depth charge at their center point. If all goes well, the tunnels will collapse. Get a move on!